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 counties and county boroughs

This list of Welsh lakes ordered by principal areas (counties and county boroughs) 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 principal area 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.AreaSatatus/Use
AcresHectares
Llyn Alaw River Alaw SH375853 762308water supply to north Anglesey
Llyn Bodgylched No main catchment SH585770
Llyn Cefni Afon Cefni SH443771 16768water supply to central Anglesey
Llyn Coron No main catchment SH380700 6928
Llyn Dinam No main catchment SH312778 249.7
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 6526former water supply to Rhosneigr
Llyn Pen y Parc No main catchment SH585751 water supply (disused)
Llyn Penrhyn No main catchment SH313770 5522RSPB bird reserve
Llyn Rhosddu No main catchment SH425648
Llyn Traffwll No main catchment SH325770 9137
Llyn Treflesg No main catchment SH307770 RSPB bird reserve

Blaenau Gwent

Lake nameCatchmentGrid ref.AreaSatatus/Use
AcresHectares
Blaen-y-Cwm Reservoir (Blaen Clydach Reservoir) Ebbw River/River Clydach SO174131 5020Reservoir, 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 6.252.53amenity, 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.AreaSatatus/Use
AcresHectares
Kenfig Pool River Kenfig SS797815 7028natural lake
Craig yr Aber Reservoir Nant Craig yr Aber SS853857 man-made dam

Caerphilly

Lake nameCatchmentGrid ref.AreaSatatus/Use
AcresHectares
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 52.0reservoir
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 145.7built as canal feed reservoir.

Cardiff

Lake nameCatchmentGrid ref.AreaSatatus/Use
AcresHectares
Cardiff Bay River Taff/River Ely ST190726 500200amenity
Hendre Lake No main catchment ST245805 124.9recreation and amenity
Llanishen Reservoir Rhymney River ST185815 5924water supply to Cardiff
Lisvane Reservoir Rhymney River ST189822 water supply to Cardiff
Roath lake Rhymney River ST184795 3012recreation and amenity

Carmarthenshire

Lake nameCatchmentGrid ref.AreaSatatus/Use
AcresHectares
Llyn Brianne River Tywi SN790485 530210regulation reservoir
Garn Ffrwd pond? Gwendraeth Fach SN508142 52.0
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 2510natural
Llyn Taliaris Afon Dulais SN634283
Lower Talley Lake Afon Cothi SN633331 6225natural 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.AreaSatatus/Use
AcresHectares
Llyn Bach River Teifi SN788668 natural lake
Llyn Berwyn River Teifi SN743569 4016natural 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 7028natural 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.AreaSatatus/Use
AcresHectares
Aled Isaf Reservoir River Clwyd SH912594 65.726.6water supply
Llyn Aled River Clwyd SH917574 112.745.6water supply
Llyn Alwen River Dee SH898565 6526
Alwen Reservoir River Dee SH943538 372.9150.9water supply
Llyn Bochlwyd River Ogwen SH654592 104.0
Llyn Bodgynydd River Conwy SH760592 145.7industrial supply (disused)
Llyn Brenig River Dee SH973555 920370flow regulation
Llyn Coedty River Conwy SH754666 11.64.7hydroelectricity
Llyn Conwy River Conwy SH780462 101.341.0water supply for Llanrwst
Llyn Cowlyd River Conwy SH727624 269109water supply for Conwy
Llyn Crafnant River Conwy SH749610 5221former water supply for Trefriw and Llanrwst
Dulyn Reservoir River Conwy SH700665 3313water supply
Llyn Eigiau River Conwy SH720651 12049
Llyn Elsi River Conwy SH783552 2611water supply for Betws-y-coed
Llyn Geirionydd River Conwy SH763608 4518
Llyn Goddionduon River Conwy SH753586 104.0
Llyn y Foel-frech River Clwyd SH919593 Tiny natural lake
Ffynnon Lloer River Ogwen SH662621 62.4
Ffynnon Llugwy River Conwy SH692627 4016
Llynnau Mymbyr River Conwy SH708575 5823
Llyn Ogwen River Ogwen SH659604 7832
Llyn y Parc River Conwy SH792588 228.9
Llyn-y-foel Afon Lledr SH714547 natural lake

Denbighshire

Lake nameCatchmentGrid ref.AreaSatatus/Use
AcresHectares
Brickfields Pond River Clwyd SJ012803 8.93.6 Local nature reserve
Llyn Brân SH961592 31.412.7natural
Llyn Brenig River Dee SH973555 920370flow regulation
Llyn Cyfynwy SJ217546 17.57.1
Llyn Gweryd SJ172550 13.15.3
Llyn Mynyllod SJ012402 6.22.5
Nant-y-Ffrith Reservoir River Cegidog SJ242530 12.14.9
Pendinas Reservoir River Cegidog SJ235518 16.36.6
Rhyl Marine Lake River Clwyd SH999804 28.711.6
unnamed lake on Rûg estate River Dee SJ058440 8.43.4

Flintshire

Lake nameCatchmentGrid ref.AreaSatatus/Use
AcresHectares
Llyn Helyg River Clwyd SJ113772 3715
Padeswood Pool SJ278619 12.65.1angling
Shotwick Lake River Dee SJ315725 amenity
unnamed reservoir, Cilcain SJ155641 5.42.2
unnamed reservoir, Oakenholt SJ262710 5.72.3
Ysceifiog Lake SJ147716 13.85.6

Gwynedd

Lake nameCatchmentGrid ref.AreaSatatus/Use
AcresHectares
Llyn yr Adar River Glaslyn SH655479 104.0
Llyn Anafon Afon Aber SH698698 135.3water supply
Llyn Arenig Fach SH827417 3414natural lake
Llyn Arenig Fawr River Dee SH846380 8434water supply for Bala town, natural lake
Llynnau Barlwyd River Dwyryd SH710484 10 and 54.0 and 2.0industrial water supply
Llyn y Bi River Mawddach SH669264 62.4
Llyn Bodlyn Afon Ysgethin SH648239 4217water supply
Llyn Bowydd River Dwyryd SH725467 228.9industrial water supply.
Llyn Caerwych River Dwyryd SH640350 52.0
Llyn Cau River Dysynni SH714123 3313
Llyn Celyn River Dee SH860405 815330river regulation
Llyn Conglog River Dwyryd SH674473 187.3
Llyn Conglog Mawr River Dwyryd SH758387 83.2
Craiglyn Dyfi also written as Creiglyn Dyfi River Dyfi SH867225 156.1natural corrie lake
Llyn Croesor River Glaslyn SH661457 52.0
Llyn Cwm Corsiog Afon Dwyryd SH663470 72.8industrial water supply (disused)
Llyn Cwellyn Afon Gwyrfai SH559549 21587water supply, natural
Llyn Cwm Bychan Afon Artro SH640312 2510
Llyn Cwm Dulyn Afon Llyfni SH492495 3414water supply
Llyn Cwmffynnon River Conwy SH649562 208.1
Llyn Cwm-mynach River Mawddach SH678237 145.7
Llyn Cwmorthin River Dwyryd SH677463 228.9
Llynnau Cwm Silyn Afon Llyfni SH513508 15 and 156.1 and 6.1
Llyn Cwm y Foel River Glaslyn SH655468 83.2
Llyn Cwmystradllyn River Dwyfor SH561444 9840natural lake
Llyn Cynwch River Mawddach SH737207 2611amenity
Llyn Dinas River Glaslyn SH616495 6024natural lake
Llynnau Diwaunedd River Conwy SH682537 19 and 137.7 and 5.3natural lakes
Llyn Dulyn Afon Ysgethin SH661244 52.0natural lake, reservoir
Llyn Du'r Arddu River Seiont SH600557 52.0natural lake
Llyn Dwythwch River Seiont SH570580 249.7
Llyn y Dywarchen Afon Gwyrfai SH560534 4016
Llyn Edno River Glaslyn SH663497 104.0
Llyn Eiddew-mawr Afon Artro SH646338 228.9
Llyn Ffynnon y Gwas Afon Gwyrfai SH591553 104.0
Llyn y Gadair Afon Gwyrfai SH568521 5020
Llyn Gwynant River Glaslyn SH644519 8534
Llyn Hesgyn River Dee SH885442 52.0
Llyn Hywel SH663266 135.3
Llyn Idwal River Ogwen SH645596 2811
Llyn Irddyn Afon Ysgethin SH629222 natural lake
Llyn Llagi River Glaslyn SH649482 83.2
Llyn Llydaw River Glaslyn SH629543 11045
Llyn Llywelyn River Glaslyn SH562499 62.4
Llyn Mair River Dwyryd SH652412 145.7Artificial lake
Llyn Manod River Dwyryd SH717449 166.5 [5]
Marchlyn Bach reservoir River Seiont SH607625
Marchlyn Mawr River Seiont SH615622 hydroelectricity
Llyn Mwyngil (Talyllyn Lake) River Dysynni SH717099 22089
Llyn Nantlle Uchaf Afon Llyfni SH514530 8032
Llyn Newydd River Dwyryd SH722471 124.9
Llyn Peris River Seiont SH591595 9538lower reservoir for pump storage hydro-electricity
Llyn Padarn River Seiont SH572613 280110natural lake used for recreation
Tanygrisiau Reservoir River Dwyryd SH679441 9538
Llyn Tecwyn Isaf SH629370 72.8
Llyn Tecwyn Uchaf River Dwyryd SH640381 3113
Bala Lake (Llyn Tegid) River Dee SH911338 1,196484Largest natural water in Wales
Llyn Teyrn River Glaslyn SH641547 52.0
Llyn Trawsfynydd River Dwyryd SH674377 1,180480nuclear power (formerly) and hydroelectric energy
Llyn Tryweryn River Dee SH788384 208.1
Llyn Wylfa Afon Mawddach SH671162 62.4natural lake

Merthyr Tydfil

Lake nameCatchmentGrid ref.AreaSatatus/Use
AcresHectares
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.AreaSatatus/Use
AcresHectares
Llandegfedd Reservoir River Usk ST325985 434176water supply
Pwll Pen-ffordd-goch / Keepers Pond River Usk SO255109 amenity, formerly served Garn-ddyrys ironworks
Wentwood Reservoir River Usk ST430929 4117water supply

Neath Port Talbot

Lake nameCatchmentGrid ref.AreaSatatus/Use
AcresHectares
Cwmwernderi Reservoir SS817902 reservoir
Eglwys Nunydd River Afan SS791855 260110industrial water supply, fishing
Furzemill Pond River Afan SS810857 52.0former 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.AreaSatatus/Use
AcresHectares
Bosherston Lakes Coastal stream SR974946 artificial
Llys-y-Frân Reservoir Western Cleddau SN036242 21286water supply
Rosebush Reservoir Western Cleddau SN061291 3012water supply

Powys

Lake nameCatchmentGrid ref.AreaSatatus/Use
AcresHectares
Abernant Lake River Irfon SN891462 52.0Created in 1903 by damming an oxbow of the Irfon
Beacons Reservoir River Taff SN987182 5221water supply
Bugeilyn  [ cy ] River Dyfi SN822923 Natural
Caban-coch Reservoir River Severn SN924645 500200water supply. See note regarding area
Cantref Reservoir * River Taff SN996154 4217water supply
Llyn Carw River Wye SN856611 tiny natural lake
Claerwen Reservoir River Severn SN854651 664269water supply
Llyn Clywedog River Severn SN911870 river regulation
Craig-goch Reservoir River Severn SN893686 21788water supply
Cray Reservoir River Usk SN883220 10040water supply
Llyn Cwm Llwch River Usk SO001220 1–20.40–0.81tiny glacier lake
Dol-y-gaer (or Pentwyn) Reservoir * River Taff SO054144 water supply
Garreg-ddu Reservoir River Severn SN911639 500200water supply. See note regarding area
Llyn Glanmerin River Dyfi SN755990 natural lake
Glaslyn  [ cy ] River Dyfi SN826941
Llyn Gludy River Usk SO018298
Llan Bwch-llyn Lake River Wye SO119463 3012Mesotrophic lake. Area is approximate.
Llangorse Lake River Usk SO132266 327132natural 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 12450water supply
Pontsticill Reservoir* River Taff SO060118 water supply
Pwll gwy-rhoc River Clydach SO183153 52.0natural lake. Area is approximate.
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.AreaSatatus/Use
AcresHectares
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 15061water supply
Llyn Fawr River Cynon SN917034 249.7Natural 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.AreaSatatus/Use
AcresHectares
Lake Fendrod River Tawe SS676967 135.3amenity
Lower Lliw Reservoir River Lliw SN650036 water supply
Oxwich Marsh Lake coastal stream SS503873 156.1natural lake. Area is a minimum figre.
Upper Lliw Reservoir River Lliw SN661062 water supply
Tawe Barrage River Tawe SS664926 amenity
Specimen Lake River Loughor SN598056 104.0amenity/angling

Torfaen

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

Vale of Glamorgan

Lake nameCatchmentGrid ref.AreaSatatus/Use
AcresHectares
Cosmeston Lake River Cadoxton ST176692 amenity
Hensol Lake River Ely ST045789 amenity and reservoir
Hensol Mill Pond River Ely ST050790 62.4former mill pond

Wrexham

Lake nameCatchmentGrid ref.AreaSatatus/Use
AcresHectares
Cae Llwyd Reservoir River Dee SJ270479 10.64.3
Chirk Castle Lake River Dee SJ269386 11.14.5
Fenn's Bank Mere SJ505386 8.43.4
Gresford Flash River Dee SJ346536 8.23.3amenity
Hanmer Mere SJ452392 44.418.0natural lake, SSSI
Monk's Pool River Dee SJ303448 5.22.1
Pant-yr-ochain Lake River Dee SJ349529 14.15.7
Penycae Top Reservoir River Dee SJ267452 6.22.5
Ty Mawr Reservoir River Dee SJ276480 21.38.6
Wynnstay Park Lake River Dee SJ307428 8.93.6

By national park

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

Brecon Beacons

Lake nameCatchmentGrid ref.AreaStatus/Use County / County Borough(s)
AcresHectares
Beacons Reservoir River Taff SN987182 5221water supplyPowys
Cantref Reservoir * River Taff SN996154 4217water supplyPowys, Rhondda Cynon Taf
Cray Reservoir River Usk SN883220 10040water supplyPowys
Dol-y-gaer (or Pentwyn) Reservoir * River Taff SO054144 water supplyPowys
Llyn Gludy River Usk SO018298 Powys
Llangorse Lake River Wye SO132266 327132natural lakePowys
Llangynidr Reservoir Ebbw River SO153141 reservoirPowys
Llwyn-on Reservoir * River Taff SO012113 15061water 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 52.0natural lake. Area is approximate.Powys
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.AreaStatus/UsePrincipal area/s
AcresHectares
Bosherston Lakes Coastal stream SR974946 natural lakesPembrokeshire
Rosebush Reservoir, Rosebush Western Cleddau SN061291 3012water supplyPembrokeshire

Snowdonia

Lake nameCatchmentGrid ref.AreaStatus/UsePrincipal area/s
AcresHectares
Llyn yr Adar River Glaslyn SH655479 104.0Gwynedd
Llyn Anafon Afon Aber SH698698 135.3water supply
Llyn Arenig Fach SH827417 3414natural lakeGwynedd
Llyn Arenig Fawr River Dee SH846380 8434water supply, natural lakeGwynedd
Llynnau Barlwyd River Dwyryd SH710484 10 and 54.0 and 2.0industrial water supplyGwynedd
Llyn y Bi River Mawddach SH669264 62.4Gwynedd
Llyn Bochlwyd River Ogwen SH654592 104.0Conwy
Llyn Bodgynydd SH760592 145.7industrial supply (disused)Conwy
Llyn Bodlyn Afon Ysgethin SH648239 4217water supplyGwynedd
Llyn Bowydd River Dwyryd SH725467 228.9industrial water supplyGwynedd
Llyn Caerwych River Dwyryd SH640350 52.0Gwynedd
Llyn Cau River Dysynni SH714123 3313Gwynedd
Llyn Celyn River Dee SH858405 815330river regulationGwynedd
Llyn Coedty River Conwy SH754666 11.64.7hydroelectricityConwy
Llyn Conglog River Dwyryd SH674473 187.3Gwynedd
Llyn Conglog Mawr River Dwyryd SH758387 83.2Gwynedd
Llyn Conwy River Conwy SH780462 101.341.0water supply for Llanrwst Conwy
Llyn Cowlyd River Conwy SH727624 269109water supply for Conwy Conwy
Llyn Crafnant River Conwy SH749610 5221former water supplyConwy
Creiglyn Dyfi River Dyfi SH867225 156.1natural corrie lakeGwynedd
Llyn Croesor River Glaslyn SH661457 52.0Gwynedd
Llyn Cwm Corsiog SH663470 72.8industrial water supply (disused)
Llyn Cwellyn Afon Gwyrfai SH559549 21587water supplyGwynedd
Llyn Cwm Bychan Afon Artro SH640312 2510Gwynedd
Llyn Cwm Dulyn Afon Llyfni SH492495 3414water supplyGwynedd
Llyn Cwmffynnon River Conwy SH649562 208.1Gwynedd
Llyn Cwm-mynach River Mawddach SH678237 145.7Gwynedd
Llyn Cwmorthin River Dwyryd SH677463 228.9Gwynedd
Llynnau Cwm Silyn Afon Llyfni SH513508 15 and 156.1 and 6.1Gwynedd
Llyn Cwm y Foel River Glaslyn SH655468 83.2Gwynedd
Llyn Cwmystradllyn River Dwyfor SH561444 9840natural lakeGwynedd
Llyn Cynwch River Mawddach SH737207 2611amenityGwynedd
Llyn Dinas River Glaslyn SH616495 6024natural lakeGwynedd
Llynnau Diwaunedd River Conwy SH682537 19 and 137.7 and 5.3natural lakesGwynedd
Llyn Dulyn Afon Ysgethin SH661244 52.0natural lake, reservoirGwynedd
Dulyn Reservoir River Conwy SH700665 3313water supplyConwy
Llyn Du'r Arddu River Seiont SH600557 52.0natural lakeGwynedd
Llyn Dwythwch River Seiont SH570580 249.7Gwynedd
Llyn y Dywarchen Afon Gwyrfai SH560534 4016Gwynedd
Llyn Edno River Glaslyn SH663497 104.0Gwynedd
Llyn Eiddew-mawr Afon Artro SH646338 228.9Gwynedd
Llyn Eigiau River Conwy SH720651 12049Conwy
Llyn Elsi River Conwy SH783552 2611water supplyConwy
Llyn Ffynnon y Gwas Afon Gwyrfai SH591553 104.0Gwynedd
Llyn-y-foel Afon Lledr SH714547 natural lakeConwy
Llyn y Gadair Afon Gwyrfai SH568521 5020Gwynedd
Llyn Geirionydd River Conwy SH763608 4518Conwy
Llyn Goddionduon River Conwy SH753586 104.0Conwy
Llyn Gwynant River Glaslyn SH644519 8534Gwynedd
Llyn Hesgyn River Dee SH885442 52.0Gwynedd
Llyn Hywel SH663266 135.3Gwynedd
Llyn Idwal River Ogwen SH645596 2811Gwynedd
Llyn Irddyn Afon Ysgethin SH629222 natural lakeGwynedd
Llyn Llagi River Glaslyn SH649482 83.2Gwynedd
Ffynnon Lloer River Ogwen SH662621 62.4Conwy
Ffynnon Llugwy River Conwy SH692627 4016Conwy
Llyn Llydaw River Glaslyn SH629543 11045Gwynedd
Llyn Llywelyn River Glaslyn SH562499 62.4Gwynedd
Llyn Mair River Dwyryd SH652412 145.7Gwynedd
Marchlyn Bach reservoir River Seiont SH607625 Gwynedd
Marchlyn Mawr River Seiont SH615622 hydroelectricityGwynedd
Tal-y-llyn Lake (Llyn Mwyngil) River Dysynni SH717099 22089Gwynedd
Llynnau Mymbyr River Conwy SH708575 5823Conwy
Llyn Nantlle Uchaf Afon Llyfni SH514530 8032Gwynedd
Llyn Newydd River Dwyryd SH722471 124.9Gwynedd
Llyn Ogwen River Ogwen SH659604 7832Conwy
Llyn y Parc River Conwy SH792588 228.9Conwy
Tanygrisiau Reservoir River Dwyryd SH679441 9538Gwynedd
Llyn Tecwyn Isaf SH629370 72.8Gwynedd
Llyn Tecwyn Uchaf River Dwyryd SH640381 3113Gwynedd
Bala Lake – (Llyn Tegid) River Dee SH911338 1,196484Gwynedd
Llyn Teyrn River Glaslyn SH641547 52.0Gwynedd
Llyn Trawsfynydd River Dwyryd SH674377 1,180480nuclear power (formerly) & HEPGwynedd
Llyn Tryweryn River Dee SH788384 208.1Gwynedd
Llyn Wylfa SH671163 62.4Gwynedd

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/UsePrincipal 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

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References

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  9. "Future capacity to supply'". What Do They Know?. What Do They Know?. Retrieved 2 September 2020.
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