The River Severn, at 220 miles (354 km) long, is the longest river in Great Britain. It is also the river with the most voluminous flow of water by far in all of England and Wales, with an average flow rate of 107 m3/s (3,800 cu ft/s) at Apperley, Gloucestershire. It rises in the Cambrian Mountains in mid Wales, at an altitude of 2,001 feet (610 m), on the Plynlimon massif, which lies close to the Ceredigion/Powys border near Llanidloes. The river then flows through Shropshire, Worcestershire and Gloucestershire. The county towns of Shrewsbury, Worcester and Gloucester lie on its course.
The River Orwell flows through the county of Suffolk in England from Ipswich to Felixstowe. Above Ipswich, the river is known as the River Gipping, but its name changes to the Orwell at Stoke Bridge, where the river becomes tidal. It broadens into an estuary at Ipswich, where the Ipswich dock has operated since the 7th century, and then flows into the North Sea at Felixstowe, the UK's largest container port, after joining the River Stour at Shotley forming Harwich harbour.
The Bristol Channel is a major inlet in the island of Great Britain, separating South Wales and South West England. It extends from the smaller Severn Estuary of the River Severn to the North Atlantic Ocean. It takes its name from the English city and port of Bristol.
Ramsey Island is an island about 1 kilometre off St David's Head in Pembrokeshire on the northern side of St Brides Bay, in southwest Wales, in the community of St Davids and the Cathedral Close. It is 259 hectares in area. Ramsey means Hrafn's island.
Cardigan Island is an uninhabited island north of Cardigan, Ceredigion, south-west Wales. It reaches a height of 52 metres (171 ft) a.s.l., and 38 acres (15 ha) in area.
Barry Island is a district, peninsula and seaside resort, forming part of the town of Barry in the Vale of Glamorgan, South Wales. It is named after the 6th century Saint Baruc. Barry's stretch of coast, on the Bristol Channel, has the world's second highest tidal range of 15 metres (49 ft), second only to the Bay of Fundy in Nova Scotia, Atlantic Canada.
A tidal island is a raised area of land within a waterbody, which is connected to the larger mainland by a natural isthmus or man-made causeway that is exposed at low tide and submerged at high tide, causing the land to switch between being a promontory/peninsula and an island depending on tidal conditions.
Strumble Head is a rocky headland in the community of Pencaer in Pembrokeshire, Wales, within the Pembrokeshire Coast National Park. It marks the southern limit of Cardigan Bay. Three islands lie off the head: Ynys Meicel – 112 feet (34 m) – Ynys Onnen and Carreg Onnen.
Middle Mouse is an uninhabited island situated 1 kilometre off the north coast of Anglesey. It is notable as the northernmost point of Wales. The island measures a maximum of 207 metres by 110 metres, with a maximum area of 3.7 acres and has a maximum altitude of 16 metres (52') above sea level. It is one of a chain of three islands off the north of Anglesey, the others being Ynys Amlwch and Maen y Bugail.
Ynys Llanddwyn is a small tidal island off the west coast of Anglesey, northwest Wales. The nearest settlement is the village of Newborough.
The River Yar on the Isle of Wight, England, rises near the beach at Freshwater Bay, on the south coast, and flows only a few miles north to Yarmouth where it meets the Solent. Most of the river is a tidal estuary. Its headwaters have been truncated by erosion of the south coast.
The Ythan Estuary is the tidal component of the Ythan River, emptying into the North Sea 19 kilometres (12 mi) north of Aberdeen, Scotland. The estuary’s tidal action extends a 7 kilometres (4.3 mi) inland and has characteristic widths of between 250 metres (820 ft) and 780 metres (2,560 ft). Besides the tidal channel there are interfaces to the upland dunes including mudflats, sand beaches and shingle flats. Reaches of salt marsh occur, but they are primarily near the Waterside Bridge and the mouth of the Tarty Burn, a small tributary river. Based upon the habitat of the moorland bordering the east of the Ythan River near the mouth, this estuary is the most significant coastal moorland in the northern United Kingdom.
Church Island, also known as Llandysilio Island, is a small island in the Menai Strait on the shores of Anglesey to which it is attached by a short causeway that is reachable only on foot. The dominant feature of the island is with St Tysilio's Church, constructed in the 15th century, its churchyard, and a grade-II listed war memorial. The 20th-century bard Cynan is among several notable people buried in the churchyard. The Anglesey Coastal Path passes the head of the causeway.
Dulas Bay is a small bay on the north east coast of Anglesey, north Wales, forming the boundary between Llaneilian and Moelfre communities. The bay is bordered by three beaches.
The Anglesey Coastal Path is a 200-kilometre (124 mi) long-distance footpath around the island of Anglesey in North Wales. The route is part of the Wales Coast Path.
The Isle of Anglesey is a county off the north-west coast of Wales. It is named after the island of Anglesey, which makes up 94% of its area, but also includes Holy Island and some islets and skerries. The county borders Gwynedd across the Menai Strait to the southeast, and is otherwise surrounded by the Irish Sea. Holyhead is the largest town, and the administrative centre is Llangefni. The county is part of the preserved county of Gwynedd.
The Afon Alaw is a river on Anglesey in Wales which rises near Llanerch-y-medd and flows northwards into the reservoir of Llyn Alaw. Below the dam it then flows southwestwards to the island's west coast near Llanfachraeth. Its lower reaches, west of the A5025 road, are tidal.
The Menai Strait fish weirs are historically important fishing traps used in the fast-flowing tidal waters of the Menai Strait, which separates Anglesey from the rest of North Wales. The strait was particularly well suited to utilising fish weirs. The tidal waters pull huge volumes of water past the coastline with every tide, and the weirs and traps enabled fish to be concentrated into small holding areas from which they can be readily caught. Such methods are thought to have been used from earliest times, but the submerged and standing remains along both the Anglesey and Gwynedd coasts are from medieval and post-medieval periods, and in some cases were still in use into the 20th century.
Ynys Faelog is a small tidal island in the Menai Strait between Gwynedd and the Isle of Anglesey, Wales, near the town of Menai Bridge. On average it measures 140 metres by 130 metres and is connected by a narrow stone causeway to the Anglesey mainland. There is a two-storey house on the island with three outbuildings and a boathouse.
