List of lakes of Wales

Last updated

Wales.rivers.lakes.jpg

This is a list of lakes in Wales, including those created as reservoirs. The names of most lakes in Wales start with the word "Llyn", which is Welsh for "lake". Except where otherwise referenced, all lakes listed here are named on the relevant Ordnance Survey map at 1:25000 scale. [1]

Contents

By area

In terms of surface area, the ten largest lakes in Wales are

All of the above, with the exception of Bala Lake, are reservoirs held back by dams. Bala Lake was the largest natural lake in Wales though its level has been artificially controlled by sluices since about 1804. [2] The largest natural lake in South Wales is Llangorse Lake (Llyn Syfaddan), which is also the second largest natural lake.

By unitary authority

This list of Welsh lakes ordered by unitary authority includes lakes with a surface area of greater than 5 acres (2.0  ha ), but excludes those lakes and ponds created as part of an active industrial site (i.e., works ponds) and also excludes service reservoirs used to store drinking water as part of the water supply system. Grid references identify the approximate centre of the lake or the dam in the case of artificial reservoirs. For some lakes the unitary authority boundary passes through a lake; in these cases the lake is represented in the list for each appropriate authority. Known occurrences include Llyn Brenig, Pontsticill Reservoir, Llwyn-on Reservoir, Cantref Reservoir and Dol-y-gaer Reservoir. All occurrences are marked with an asterisk (*). [3]

Anglesey

Lake nameCatchmentGrid ref.Area (acres)Status/Use
Llyn Alaw River Alaw SH375853 762water supply to north Anglesey
Llyn Bodgylched No main catchment SH585770
Llyn Cefni Afon Cefni SH443771 167water supply to central Anglesey
Llyn Coron No main catchment SH380700 69
Llyn Dinam No main catchment SH312778 24
Llyn y Gors No main catchment SH575748 amenity (fishing)
Llyn Gwaith-glo No main catchment SH450713
Llyn Llygeirian No main catchment SH347898
Llyn Llywenan No main catchment SH347815 Largest natural body of water on Anglesey
Llyn Llwydiarth Afon Braint SH549786
Llyn Maelog No main catchment SH325730 65former water supply to Rhosneigr
Llyn Pen y Parc No main catchment SH585751 water supply (disused)
Llyn Penrhyn No main catchment SH313770 55RSPB bird reserve
Llyn Rhosddu No main catchment SH425648
Llyn Traffwll No main catchment SH325770 91
Llyn Treflesg No main catchment SH307770 RSPB bird reserve

Blaenau Gwent

Lake nameCatchmentGrid ref.Area (acres)Status/Use
Blaen-y-Cwm Reservoir (Blaen Clydach Reservoir) Ebbw River/River Clydach SO174131 50Reservoir, originally constructed in 1813

to supply the Nantyglo Ironworks. [4]

Carno Reservoir Ebbw River SO164131 reservoir
Cwmtillery Reservoir Ebbw River SO220071 reservoir
Lower Boat Pond Ebbw River SO174118 6.25amenity, formerly industrial supply along with smaller Upper Boat Pond
Rhyd-y-blew Pond Ebbw River SO160112
Parc Brynbach lake Sirhowy River SO127101 amenity
Shon-Sheffrey's Reservoir Sirhowy River SO129116 reservoir

Bridgend

Lake nameCatchmentGrid ref.Area (acres)Status/Use
Kenfig Pool River Kenfig SS797815 70natural lake
Craig yr Aber Reservoir Nant Craig yr Aber SS853857 man-made dam

Caerphilly

Lake nameCatchmentGrid ref.Area (acres)Status/Use
Lower Blaen Rhymney Reservoir Rhymney River SO103103 reservoir
Upper Blaen Rhymney Reservoir Rhymney River SO098104 reservoir
Bute Town Reservoir Rhymney River SO101091
Caerphilly Castle moat Rhymney River ST155872
Nant-y-draenog Reservoir Sirhowy River ST188935 5reservoir
Parc Cwm Darran Lake Rhymney River SO117032 amenity
Rhaslas Pond Rhymney River SO095072
Ffrwd Farm lake (west) Rhymney River ST154920 angling
Ffrwd Farm lake (east) Rhymney River ST155920 angling
Pen-y-fan Pond Sirhowy River SO196004 14built as canal feed reservoir.

Cardiff

Lake nameCatchmentGrid ref.Area (acres)Status/Use
Cardiff Bay River Taff/River Ely ST190726 500amenity
Hendre Lake No main catchment ST245805 12recreation and amenity
Llanishen Reservoir Rhymney River ST185815 59water supply to Cardiff
Lisvane Reservoir Rhymney River ST189822 water supply to Cardiff
Roath lake Rhymney River ST184795 30recreation and amenity

Carmarthenshire

Lake nameCatchmentGrid ref.Area (acres)Status/Use
Llyn Brianne River Tywi SN790485 530regulation reservoir
Garn Ffrwd pond? Gwendraeth Fach SN508142 5
Llanelli North Dock lake Coastal waterbody SS498996 amenity (former dock)
Llyn Llech Owen Reservoir Gwendraeth Fawr SN568151 amenity/reservoir
Cwm Lliedi Reservoir Afon Lliedi SN519036 ex water supply
Llyn y Fan Fach River Tywi SN803219 25natural
Llyn Taliaris Afon Dulais SN634283
Lower Talley Lake Afon Cothi SN633331 62natural lake
Lagoons at National Wetlands Centre Coastal waterbodies SS529986 conservation/wildlife
Old Castle Pond/Pond TwymCoastal lake SN500003 Amenity
Sandy Water Coastal lake SN495003 amenity
Upper Lliedi Reservoir Afon Lliedi SN511045 reservoir
Upper Talley Lake Afon Cothi SN631337 natural lake
Usk Reservoir River Usk SN832288 water supply
Delta Lake Coastal lake SS507987 amenity

Ceredigion

Lake nameCatchmentGrid ref.Area (acres)Status/Use
Llyn Bach River Teifi SN788668 natural lake
Llyn Berwyn River Teifi SN743569 40natural lake
Llyn Craigypistyll River Dyfi SN722858 natural lake
Dinas Reservoir River Rheidol SN748821 hydroelectricity
Llyn Du River Severn SN800698 natural lake
Llyn Egnant River Teifi SN792674 water supply
Falcondale Lake River Teifi SN569499 amenity
Llyn Frongoch River Ystwyth SN721752 lead mining ?/ natural
Llyn Fyrddon Fach River Severn SN796701 natural lake
Llyn Fyrddon Fawr River Severn SN800708 natural lake
Llyn Glandwgan River Ystwyth SN707752 natural lake
Llyn y Gorlan River Teifi SN786670 water supply
Llyn Gwngi River Severn SN839729 natural lake
Llyn Gynon River Severn SN799647 70natural lake
Llyn Hir River Teifi SN789676 water supply
Nant-y-moch Reservoir River Rheidol SN751872 hydroelectricity
Llyn Pond Gwaith River Teifi SN781675 Natural
Llyn Rhosrhydd River Ystwyth SN705759 natural lake
Llyn Syfydrin River Rheidol SN723848 natural lake
Llyn Teifi River Teifi SN781675 water supply

Conwy

Lake nameCatchmentGrid ref.Area (acres)Status/Use
Aled Isaf Reservoir River Clwyd SH912594 65.7water supply
Llyn Aled River Clwyd SH917574 112.7water supply
Llyn Alwen River Dee SH898565 65
Alwen Reservoir River Dee SH943538 372.9water supply
Llyn Bochlwyd River Ogwen SH654592 10
Llyn Bodgynydd River Conwy SH760592 14industrial supply (disused)
Llyn Brenig River Dee SH973555 920flow regulation
Llyn Coedty River Conwy SH754666 11.6hydroelectricity
Llyn Conwy River Conwy SH780462 101.3water supply for Llanrwst
Llyn Cowlyd River Conwy SH727624 269water supply for Conwy
Llyn Crafnant River Conwy SH749610 52former water supply for Trefriw and Llanrwst
Dulyn Reservoir River Conwy SH700665 33water supply
Llyn Eigiau River Conwy SH720651 120
Llyn Elsi River Conwy SH783552 26water supply for Betws-y-coed
Llyn Geirionydd River Conwy SH763608 45
Llyn Goddionduon River Conwy SH753586 10
Llyn y Foel-frech River Clwyd SH919593 Tiny natural lake
Ffynnon Lloer River Ogwen SH662621 6
Ffynnon Llugwy River Conwy SH692627 40
Llynnau Mymbyr River Conwy SH708575 58
Llyn Ogwen River Ogwen SH659604 78
Llyn y Parc River Conwy SH792588 22
Llyn-y-foel Afon Lledr SH714547 natural lake

Denbighshire

Lake nameCatchmentGrid ref.Area (acres)Status/Use
Brickfields Pond River Clwyd SJ012803 8.9 Local nature reserve
Llyn Brân SH961592 31.4natural
Llyn Brenig River Dee SH973555 920flow regulation
Llyn Cyfynwy SJ217546 17.5
Llyn Gweryd SJ172550 13.1
Llyn Mynyllod SJ012402 6.2
Nant-y-Ffrith Reservoir River Cegidog SJ242530 12.1
Pendinas Reservoir River Cegidog SJ235518 16.3
Rhyl Marine Lake River Clwyd SH999804 28.7
unnamed lake on Rûg estate River Dee SJ058440 8.4

Flintshire

Lake nameCatchmentGrid ref.Area (acres)Status/Use
Llyn Helyg River Clwyd SJ113772 37
Padeswood Pool SJ278619 12.6angling
Shotwick Lake River Dee SJ315725 amenity
unnamed reservoir, Cilcain SJ155641 5.4
unnamed reservoir, Oakenholt SJ262710 5.7
Ysceifiog Lake SJ147716 13.8

Gwynedd

Lake nameCatchmentGrid ref.Area (acres)Status/Use
Llyn yr Adar River Glaslyn SH655479 10
Llyn Anafon Afon Aber SH698698 13water supply
Llyn Arenig Fach SH827417 34natural lake
Llyn Arenig Fawr River Dee SH846380 84water supply for Bala town, natural lake
Llynnau Barlwyd River Dwyryd SH710484 10 + 5industrial water supply
Llyn y Bi River Mawddach SH669264 6
Llyn Bodlyn Afon Ysgethin SH648239 42water supply
Llyn Bowydd River Dwyryd SH725467 22industrial water supply.
Llyn Caerwych River Dwyryd SH640350 5
Llyn Cau River Dysynni SH714123 33
Llyn Celyn River Dee SH860405 815river regulation
Llyn Conglog River Dwyryd SH674473 18
Llyn Conglog Mawr River Dwyryd SH758387 8
Craiglyn Dyfi also written as Creiglyn Dyfi River Dyfi SH867225 15natural corrie lake
Llyn Croesor River Glaslyn SH661457 5
Llyn Cwm Corsiog Afon Dwyryd SH663470 7industrial water supply (disused)
Llyn Cwellyn Afon Gwyrfai SH559549 215water supply, natural
Llyn Cwm Bychan Afon Artro SH640312 25
Llyn Cwm Dulyn Afon Llyfni SH492495 34water supply
Llyn Cwmffynnon River Conwy SH649562 20
Llyn Cwm-mynach River Mawddach SH678237 14
Llyn Cwmorthin River Dwyryd SH677463 22
Llynnau Cwm Silyn Afon Llyfni SH513508 15 + 15
Llyn Cwm y Foel River Glaslyn SH655468 8
Llyn Cwmystradllyn River Dwyfor SH561444 98natural lake
Llyn Cynwch River Mawddach SH737207 26amenity
Llyn Dinas River Glaslyn SH616495 60natural lake
Llynnau Diwaunedd River Conwy SH682537 19 + 13natural lakes
Llyn Dulyn Afon Ysgethin SH661244 5natural lake, reservoir
Llyn Du'r Arddu River Seiont SH600557 5natural lake
Llyn Dwythwch River Seiont SH570580 24
Llyn y Dywarchen Afon Gwyrfai SH560534 40
Llyn Edno River Glaslyn SH663497 10
Llyn Eiddew-mawr Afon Artro SH646338 22
Llyn Ffynnon y Gwas Afon Gwyrfai SH591553 10
Llyn y Gadair Afon Gwyrfai SH568521 50
Llyn Gwynant River Glaslyn SH644519 85
Llyn Hesgyn River Dee SH885442 5
Llyn Hywel SH663266 13
Llyn Idwal River Ogwen SH645596 28
Llyn Irddyn Afon Ysgethin SH629222 natural lake
Llyn Llagi River Glaslyn SH649482 8
Llyn Llydaw River Glaslyn SH629543 110
Llyn Llywelyn River Glaslyn SH562499 6
Llyn Mair River Dwyryd SH652412 14Artificial lake
Llyn Manod River Dwyryd SH717449 16 [5]
Marchlyn Bach reservoir River Seiont SH607625
Marchlyn Mawr River Seiont SH615622 hydroelectricity
Llyn Mwyngil (Talyllyn Lake) River Dysynni SH717099 220
Llyn Nantlle Uchaf Afon Llyfni SH514530 80
Llyn Newydd River Dwyryd SH722471 12
Llyn Peris River Seiont SH591595 95lower reservoir for pump storage hydro-electricity
Llyn Padarn River Seiont SH572613 280natural lake used for recreation
Tanygrisiau Reservoir River Dwyryd SH679441 95
Llyn Tecwyn Isaf SH629370 7
Llyn Tecwyn Uchaf River Dwyryd SH640381 31
Bala Lake (Llyn Tegid) River Dee SH911338 1,196Largest natural water in Wales
Llyn Teyrn River Glaslyn SH641547 5
Llyn Trawsfynydd River Dwyryd SH674377 1,180nuclear power (formerly) and hydroelectric energy
Llyn Tryweryn River Dee SH788384 20
Llyn Wylfa Afon Mawddach SH671162 6natural lake

Merthyr Tydfil

Lake nameCatchmentGrid ref.Area (acres)Status/Use
Cyfarthfa Castle Lake River Taff SO039073 amenity
Dol-y-gaer (or Pentwyn) Reservoir * River Taff SO060118 water supply
Llwyn-on Reservoir * River Taff SO012113 water supply
Penywern Middle Pond River Taff SO073083 angling
Penywern Top Pond River Taff SO071086 angling
Pontsticill Reservoir * River Taff SO060118 water supply

Monmouthshire

Lake nameCatchmentGrid ref.Area (acres)Status/Use
Llandegfedd Reservoir River Usk ST325985 434water supply
Pwll Pen-ffordd-goch / Keepers Pond River Usk SO255109 amenity, formerly served Garn-ddyrys ironworks
Wentwood Reservoir River Usk ST430929 41water supply

Neath Port Talbot

Lake nameCatchmentGrid ref.Area (acres)Status/Use
Cwmwernderi Reservoir SS817902 reservoir
Eglwys Nunydd River Afan SS791855 260industrial water supply, fishing
Furzemill Pond River Afan SS810857 5former millpond?
Llyn Fach River Neath SN905037 Natural lake
Rheola Pond River Neath SN843043
larger un-named lake at Aberclwyd River Neath SN847043 amenity
smaller un-named lake at Aberclwyd River Neath SN852045 amenity

Pembrokeshire

Lake nameCatchmentGrid ref.Area (acres)Status/Use
Bosherston Lakes Coastal stream SR974946 artificial
Llys-y-Frân Reservoir Western Cleddau SN036242 212water supply
Rosebush Reservoir Western Cleddau SN061291 30water supply

Powys

Lake nameCatchmentGrid ref.Area (acres)Status/Use
Abernant Lake River Irfon SN891462 5Created in 1903 by damming an oxbow of the Irfon
Beacons Reservoir River Taff SN987182 52water supply
Bugeilyn  [ cy ] River Dyfi SN822923 Natural
Caban-coch Reservoir River Severn SN924645 500See notewater supply
Cantref Reservoir * River Taff SN996154 42water supply
Llyn Carw River Wye SN856611 tiny natural lake
Claerwen Reservoir River Severn SN854651 664water supply
Llyn Clywedog River Severn SN911870 river regulation
Craig-goch Reservoir River Severn SN893686 217water supply
Cray Reservoir River Usk SN883220 100water supply
Llyn Cwm Llwch River Usk SO001220 1-2tiny glacier lake
Dol-y-gaer (or Pentwyn) Reservoir * River Taff SO054144 water supply
Garreg-ddu Reservoir River Severn SN911639 500See notewater supply
Llyn Glanmerin River Dyfi SN755990 natural lake
Glaslyn  [ cy ] River Dyfi SN826941
Llyn Gludy River Usk SO018298
Llan Bwch-llyn Lake River Wye SO119463 c.30Mesotrophic lake
Llangorse Lake River Usk SO132266 327natural lake, largest in South Wales
Llangynidr Reservoir Ebbw River SO153141 reservoir
Llyn Lluncaws Afon Tanat SJ07143169 natural lake
Llyn y Fan Fawr River Tawe SN832216
Upper Neuadd Reservoir River Taff SO029188 water supply
Penygarreg Reservoir River Severn SN911673 124water supply
Pontsticill Reservoir* River Taff SO060118 water supply
Pwll gwy-rhoc River Clydach SO183153 c.5natural lake
Talybont Reservoir River Usk SO104205 water supply
Ty Mawr Pool River Usk SO074264 natural lake
Lake Vyrnwy River Vyrnwy SH989213 water supply
Ystradfellte Reservoir River Neath SN945175 water supply

Note: Caban Coch and Garreg-ddu reservoirs are separately named but form one contiguous area of water at normal levels. The area quoted is for the two combined. At high water levels, Pentwyn Reservoir is continuous with Pontsticill Reservoir, its dam being submerged.

Rhondda Cynon Taf

Lake nameCatchmentGrid ref.Area (acres)Status/Use
Cantref Reservoir * River Taff SN996154 water supply
Dare Valley Country Park lower lake River Cynon SN977028 amenity
Lluest-wen Reservoir River Rhondda Fach SN947017
Llwyn-on Reservoir * River Taff SO012113 150water supply
Llyn Fawr River Cynon SN917034 24Natural but expanded for water supply
Nant-hir Reservoir River Cynon SN989069
Nant-moel Reservoir River Cynon SN982071
Penderyn Reservoir River Neath SN938072
?Perthgelyn Reservoir River Cynon ST053970 reservoir

Swansea

Lake nameCatchmentGrid ref.Area (acres)Status/Use
Lake Fendrod River Tawe SS676967 13amenity
Lower Lliw Reservoir River Lliw SN650036 water supply
Oxwich Marsh Lake coastal stream SS503873 >15natural lake
Upper Lliw Reservoir River Lliw SN661062 water supply
Tawe Barrage River Tawe SS664926 amenity
Specimen Lake River Loughor SN598056 10amenity/angling

Torfaen

Lake nameCatchmentGrid ref.Area (acres)Status/Use
Blaen Bran Reservoir (lower) Afon Lwyd ST267971
Coity Pond Afon Lwyd SO233090 former reservoir

Vale of Glamorgan

Lake nameCatchmentGrid ref.Area (acres)Status/Use
Cosmeston Lake River Cadoxton ST176692 amenity
Hensol Lake River Ely ST045789 amenity and reservoir
Hensol Mill Pond River Ely ST050790 6former mill pond

Wrexham

Lake nameCatchmentGrid ref.Area (acres)Status/Use
Cae Llwyd Reservoir River Dee SJ270479 10.6
Chirk Castle Lake River Dee SJ269386 11.1
Fenn's Bank Mere SJ505386 8.4
Gresford Flash River Dee SJ346536 8.2amenity
Hanmer Mere SJ452392 44.4natural lake, SSSI
Monk's Pool River Dee SJ303448 5.2
Pant-yr-ochain Lake River Dee SJ349529 14.1
Penycae Top Reservoir River Dee SJ267452 6.2
Ty Mawr Reservoir River Dee SJ276480 21.3
Wynnstay Park Lake River Dee SJ307428 8.9

By national park

Lakes and reservoirs within each of Wales' three national parks.

Brecon Beacons

Lake nameCatchmentGrid ref.Area (acres)Status/UseUnitary area/s
Beacons Reservoir River Taff SN987182 52water supplyPowys
Cantref Reservoir * River Taff SN996154 42water supplyPowys, Rhondda Cynon Taf
Cray Reservoir River Usk SN883220 100water supplyPowys
Dol-y-gaer (or Pentwyn) Reservoir * River Taff SO054144 water supplyPowys
Llyn Gludy River Usk SO018298 Powys
Llangorse Lake River Wye SO132266 327natural lakePowys
Llangynidr Reservoir Ebbw River SO153141 reservoirPowys
Llwyn-on Reservoir * River Taff SO012113 150water supplyMerthyr Tydfil, Rhondda Cynon Taf
Llyn y Fan Fawr River Tawe SN832216 natural lakePowys
Upper Neuadd Reservoir River Taff SO029188 water supplyPowys
Pontsticill Reservoir* River Taff SO060118 water supplyMerthyr Tydfil, Powys
Pwll Gwy-rhoc River Clydach SO183153 c.5natural lakePowys
Talybont Reservoir River Usk SO104205 water supplyPowys
Ty Mawr Pool River Usk SO074264 natural lakePowys
Usk Reservoir River Usk SN832288 water supplyCarmarthenshire, Powys
Ystradfellte Reservoir River Neath SN945175 water supplyPowys

Pembrokeshire Coast

Lake nameCatchmentGrid ref.Area (acres)Status/UseUnitary area/s
Bosherston Lakes Coastal stream SR974946 natural lakesPembrokeshire
Rosebush Reservoir, Rosebush Western Cleddau SN061291 30water supplyPembrokeshire

Snowdonia

Lake nameCatchmentGrid ref.Area (acres)Status/Useunitary area/s
Llyn yr Adar River Glaslyn SH655479 10Gwynedd
Llyn Anafon Afon Aber SH698698 13water supply
Llyn Arenig Fach SH827417 34natural lakeGwynedd
Llyn Arenig Fawr River Dee SH846380 84water supply, natural lakeGwynedd
Llynnau Barlwyd River Dwyryd SH710484 10 + 5industrial water supplyGwynedd
Llyn y Bi River Mawddach SH669264 6Gwynedd
Llyn Bochlwyd River Ogwen SH654592 10Conwy
Llyn Bodgynydd SH760592 14industrial supply (disused)Conwy
Llyn Bodlyn Afon Ysgethin SH648239 42water supplyGwynedd
Llyn Bowydd River Dwyryd SH725467 22industrial water supplyGwynedd
Llyn Caerwych River Dwyryd SH640350 5Gwynedd
Llyn Cau River Dysynni SH714123 33Gwynedd
Llyn Celyn River Dee SH858405 815river regulationGwynedd
Llyn Coedty River Conwy SH754666 11.6hydroelectricityConwy
Llyn Conglog River Dwyryd SH674473 18Gwynedd
Llyn Conglog Mawr River Dwyryd SH758387 8Gwynedd
Llyn Conwy River Conwy SH780462 101.3water supply for Llanrwst Conwy
Llyn Cowlyd River Conwy SH727624 269water supply for Conwy Conwy
Llyn Crafnant River Conwy SH749610 52former water supplyConwy
Creiglyn Dyfi River Dyfi SH867225 15natural corrie lakeGwynedd
Llyn Croesor River Glaslyn SH661457 5Gwynedd
Llyn Cwm Corsiog SH663470 7industrial water supply (disused)
Llyn Cwellyn Afon Gwyrfai SH559549 215water supplyGwynedd
Llyn Cwm Bychan Afon Artro SH640312 25Gwynedd
Llyn Cwm Dulyn Afon Llyfni SH492495 34water supplyGwynedd
Llyn Cwmffynnon River Conwy SH649562 20Gwynedd
Llyn Cwm-mynach River Mawddach SH678237 14Gwynedd
Llyn Cwmorthin River Dwyryd SH677463 22Gwynedd
Llynnau Cwm Silyn Afon Llyfni SH513508 15 + 15Gwynedd
Llyn Cwm y Foel River Glaslyn SH655468 8Gwynedd
Llyn Cwmystradllyn River Dwyfor SH561444 98natural lakeGwynedd
Llyn Cynwch River Mawddach SH737207 26amenityGwynedd
Llyn Dinas River Glaslyn SH616495 60natural lakeGwynedd
Llynnau Diwaunedd River Conwy SH682537 19 + 13natural lakesGwynedd
Llyn Dulyn Afon Ysgethin SH661244 5natural lake, reservoirGwynedd
Dulyn Reservoir River Conwy SH700665 33water supplyConwy
Llyn Du'r Arddu River Seiont SH600557 5natural lakeGwynedd
Llyn Dwythwch River Seiont SH570580 24Gwynedd
Llyn y Dywarchen Afon Gwyrfai SH560534 40Gwynedd
Llyn Edno River Glaslyn SH663497 10Gwynedd
Llyn Eiddew-mawr Afon Artro SH646338 22Gwynedd
Llyn Eigiau River Conwy SH720651 120Conwy
Llyn Elsi River Conwy SH783552 26water supplyConwy
Llyn Ffynnon y Gwas Afon Gwyrfai SH591553 10Gwynedd
Llyn-y-foel Afon Lledr SH714547 natural lakeConwy
Llyn y Gadair Afon Gwyrfai SH568521 50Gwynedd
Llyn Geirionydd River Conwy SH763608 45Conwy
Llyn Goddionduon River Conwy SH753586 10Conwy
Llyn Gwynant River Glaslyn SH644519 85Gwynedd
Llyn Hesgyn River Dee SH885442 5Gwynedd
Llyn Hywel SH663266 13Gwynedd
Llyn Idwal River Ogwen SH645596 28Gwynedd
Llyn Irddyn Afon Ysgethin SH629222 natural lakeGwynedd
Llyn Llagi River Glaslyn SH649482 8Gwynedd
Ffynnon Lloer River Ogwen SH662621 6Conwy
Ffynnon Llugwy River Conwy SH692627 40Conwy
Llyn Llydaw River Glaslyn SH629543 110Gwynedd
Llyn Llywelyn River Glaslyn SH562499 6Gwynedd
Llyn Mair River Dwyryd SH652412 14Gwynedd
Marchlyn Bach reservoir River Seiont SH607625 Gwynedd
Marchlyn Mawr River Seiont SH615622 hydroelectricityGwynedd
Tal-y-llyn Lake (Llyn Mwyngil) River Dysynni SH717099 220Gwynedd
Llynnau Mymbyr River Conwy SH708575 58Conwy
Llyn Nantlle Uchaf Afon Llyfni SH514530 80Gwynedd
Llyn Newydd River Dwyryd SH722471 12Gwynedd
Llyn Ogwen River Ogwen SH659604 78Conwy
Llyn y Parc River Conwy SH792588 22Conwy
Tanygrisiau Reservoir River Dwyryd SH679441 95Gwynedd
Llyn Tecwyn Isaf SH629370 7Gwynedd
Llyn Tecwyn Uchaf River Dwyryd SH640381 31Gwynedd
Bala Lake – (Llyn Tegid) River Dee SH911338 1,196Gwynedd
Llyn Teyrn River Glaslyn SH641547 5Gwynedd
Llyn Trawsfynydd River Dwyryd SH674377 1,180nuclear power (formerly) & HEPGwynedd
Llyn Tryweryn River Dee SH788384 20Gwynedd
Llyn Wylfa SH671163 6Gwynedd

By supply to England

Many Welsh lakes supply the nation itself with water, however, some lakes and reservoirs supply England. [6] [7]

The main reservoirs created for this purpose include:

Reservoir nameLocationBuilt bySupplies water to
Lake Vyrnwy Powys Liverpool CorporationLiverpool, Cheshire and Manchester
Claerwen Elan Valley reservoirs Birmingham Corporation Water DepartmentBirmingham
Craig-goch Elan Valley reservoirs Birmingham Corporation Water DepartmentBirmingham
Pen-y-garreg Elan Valley reservoirs Birmingham Corporation Water DepartmentBirmingham
Garreg-ddu Elan Valley reservoirs Birmingham Corporation Water DepartmentBirmingham,
Caban-coch [8] Elan Valley reservoirs Birmingham Corporation Water DepartmentBirmingham
Alwen Reservoir Conwy The Corporation of BirkenheadBirkenhead [9]
Llyn Celyn (via and Bala Lake) Gwynedd Liverpool Corporation Waterworks Liverpool
Llyn Clywedog Powys Reed and Mallick of Salisbury Shropshire, West Midlands to Bristol

Former lakes

Lake nameCatchmentGrid ref.Area (acres)Status/UseUnitary area
Bryn-bach Pond [10] Sirhowy River SO122100 formerly industrial use (not same site as modern lake)Blaenau Gwent
Cairn Mound Impounding Reservoir River Clydach SO202136 former reservoir [11] Blaenau Gwent
Clyn-mil Pond [12] River Taff SO062052 formerly industrial useMerthyr Tydfil
Glyn-dyrys Pond [13] River Taff SO049047 formerly industrial useMerthyr Tydfil
Hirwaun Ponds [14] River Cynon SN945060 formerly industrial useRhondda Cynon Taf
Lower Neuadd Reservoir River Taff SO030180 former reservoir (dam breached)Merthyr Tydfil [15]
Llyn Nantlle-isaf [16] Afon Llyfni SH506528 natural lake Gwynedd
Pitwellt Pond River Taff SO078098 former reservoir (dam breached)Merthyr Tydfil
Rhyd-y-blew Pond (Rassa) Ebbw River SO160112 formerly industrial useBlaenau Gwent
Scotch Peter's Reservoir [17] Sirhowy River SO155088 former reservoirBlaenau Gwent

See also

Related Research Articles

<span class="mw-page-title-main">River Dee, Wales</span> River in Wales and England

The River Dee is a river flowing through North Wales, and through Cheshire, England, in Great Britain. The length of the main section from Bala to Chester is 113 km and it is largely located in Wales. The stretch between Aldford and Chester is within England, and two other sections form the border between the two countries.

<span class="mw-page-title-main">Llanberis Lake Railway</span> Narrow-gauge heritage railway in Gwynedd, Wales, United Kingdom

The Llanberis Lake Railway is a 1 ft 11+12 in narrow gauge heritage railway that runs for 2.5 miles (4 km) along the northern shore of Llyn Padarn in north Wales in the Snowdonia National Park. The starting point is the village of Llanberis at the eastern end of the lake, with the western terminus at Pen Llyn in the Padarn Country Park. The return journey takes around 60 minutes.

The Dee regulation scheme is a system of flow balancing and quality management along the River Dee managed by a consortium of the three largest water companies licensed to take water from the river, United Utilities, Welsh Water and Severn Trent Water; together with the regulator, Natural Resources Wales.

<span class="mw-page-title-main">A499 road</span> A road in Wales, UK

The A499 road is the major road of the Llŷn peninsula in North Wales.

<span class="mw-page-title-main">Llyn Brenig</span> Artificial lake in Cerrigydrudion, north Wales, UK

Llyn Brenig is a reservoir located on Denbigh Moors in North Wales. The artificial lake, which was constructed between 1973 and 1976, was created by building an embankment dam across the Afon Brenig valley. It lies at 1,200 ft (370 m) above sea level on the border between the counties of Conwy and Denbighshire. It is used to manage the flow in the River Dee as part of the River Dee regulation system.

<span class="mw-page-title-main">Ancient Monuments Protection Act 1882</span> Act of the Parliament of the United Kingdom

The Ancient Monuments Protection Act 1882 was an Act of the Parliament of the United Kingdom of Great Britain and Ireland. It was introduced by John Lubbock, 1st Baron Avebury, recognising the need for a governmental administration on the protection of ancient monuments, and was finally passed after a number of failed attempts on heritage protection acts. The gradual change towards a state-based authority responsible for the safeguarding of the Kingdom's national heritage manifested itself through the appointment of the first Inspector of Ancient Monuments in 1882, General Pitt Rivers.

<span class="mw-page-title-main">Sarn Badrig</span> Shingle reef in Cardigan Bay, Wales

Sarn Badrig, also spelled Sarn Padrig, is one of several more or less parallel shingle reefs extending under the sea in Cardigan Bay on the west coast of Wales. The causeway is made of glacial deposits left by receding ice sheets at the end of the last ice age.

<span class="mw-page-title-main">Northumberland County, New South Wales</span> Cadastral in New South Wales, Australia

Northumberland County was one of the original Nineteen Counties in New South Wales and is now one of the 141 Cadastral divisions of New South Wales. It included the area to the north of Broken Bay, which compasses the Central Coast region and Lake Macquarie as well as Newcastle(Greater Newcastle) in the Hunter region. It was bounded by the part of the Hawkesbury River to the south, the Macdonald River to the south-west, and the Hunter River to the north.

<span class="mw-page-title-main">Camden County, New South Wales</span> Cadastral in New South Wales, Australia

Camden County was one of the original Nineteen Counties in New South Wales and is now one of the 141 Cadastral divisions of New South Wales. It included the coastal area near Wollongong south to the Shoalhaven River, and also inland encompassing Berrima and Picton. Its western boundary was the Wollondilly River. The first settlement in the area was Camden Park, established by John Macarthur in 1806, just across the Nepean River from Cumberland County. It was the first land across the Nepean to be settled. Camden is a present-day suburb of Sydney in the same area, although parts of it are in Cumberland.

<span class="mw-page-title-main">St Vincent County</span> Cadastral in Australian Capital Territory

St Vincent County was one of the original Nineteen Counties in New South Wales and is now one of the 141 Cadastral divisions of New South Wales. It included the south coast area encompassing Batemans Bay, Ulladulla, Jervis Bay and inland to Braidwood. The Shoalhaven River is the boundary to the north and west, and the Deua River the boundary to the south.

<span class="mw-page-title-main">Argyle County</span> Cadastral in New South Wales, Australia

Argyle County was one of the original Nineteen Counties in New South Wales and is now one of the 141 Cadastral divisions of New South Wales. It includes the area around Goulburn. It is bounded by Lake George in the south-west, the Shoalhaven River in the east, and the Wollondilly River in the north-east.

<span class="mw-page-title-main">Bathurst County</span> Cadastral in New South Wales, Australia

Bathurst County was one of the original Nineteen Counties in New South Wales and is now one of the 141 Cadastral divisions of New South Wales. It includes the area to the south-west of Bathurst to Cowra and Orange. The Lachlan River is the boundary to the south-west, the Belubula River forms part of the northern boundary, with the Fish River on the northeastern boundary. Blayney is located roughly in the middle.

<span class="mw-page-title-main">Auckland County</span> Cadastral in New South Wales, Australia

Auckland County is one of the 141 cadastral divisions of New South Wales. It is at the extreme south-east of the state, with the Victorian border to the south, and the area to the north of the Brogo River the boundary to the north. It includes Bega, Eden and Merimbula.

<span class="mw-page-title-main">Afon Tarell</span> River in United Kingdom, Wales

The Afon Tarell is a river in Powys, Wales, which rises to the west of the Brecon Beacons in Brecon Beacons National Park and flows north, then north-east, for 12 miles (20 km) into the River Usk.

References

  1. Ordnance Survey maps. 1:25000
  2. "Bala Bridge Sluice Gates". Royal Commission on the Ancient and Historical Monuments of Wales. 24 March 2010. Retrieved 2 September 2020.
  3. "Bing maps". Bing. Retrieved 4 September 2020.
  4. "Blaen-y-cwm Reservoir; Blaen Clydach Reservoir Ii (291635)". Coflein. RCAHMW . Retrieved 29 September 2021.
  5. Llyn Manod
  6. "UK heatwave: How much water does Wales pump to England?". bbc.co.uk. BBC. Retrieved 2 September 2020.
  7. "Elan Valley reservoirs". People's Collection of Wales. Retrieved 2 September 2020.
  8. "Powys Digital History Project: Elan Valley Reservoirs" . Retrieved 9 May 2012.
  9. "Future capacity to supply'". What Do They Know?. What Do They Know?. Retrieved 2 September 2020.
  10. "Monmouthshire X.12 (Dukestown; Llechryd; Rhymni; Tredegar), Revised: 1898 to 1899, Published: 1901". Map images. National Library of Scotland. Retrieved 4 December 2020.
  11. "Brecknockshire XLVII.3 (Bryn Mawr; Llanelli; Llangatwg), Revised: 1915, Published: 1920". Map images. Ordnance Survey at National Library of Scotland. Retrieved 4 December 2020.
  12. "Glamorgan XII.6 (Merthyr Tudful), Revised: 1915, Published: 1919". Map images. National Library of Scotland. Retrieved 4 December 2020.
  13. "Glamorgan XII (includes: Gelli Gaer; Merthyr Tudful.), Surveyed: 1868 to 1875, Published: 1885". Map images. National Library of Scotland. Retrieved 4 December 2020.
  14. "Glamorgan XI.5 (Aberdar; Penderyn; Rugos), Surveyed: 1867 to 1883, Published: 1885". Map images. National Library of Scotland. Retrieved 4 December 2020.
  15. "Welsh Water to restore reservoir to natural state". WWT. Retrieved 4 September 2020.
  16. "Caernarvonshire XXI.SW (includes: Llandwrog; Llanllyfni.), Surveyed: 1888, Published: 1888". Map images. National Library of Scotland. Retrieved 4 December 2020.
  17. "Monmouthshire XI.SW (includes: Ebbw Vale; Tredegar.), Revised: 1948 to 1949, Published: 1953". Map images. National Library of Scotland. Retrieved 4 December 2020.