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River Length Notes (miles) (km) 1 River Severn: 220 354 Longest river in the United Kingdom; leaves Wales after 48 miles (77 km). 2 River Wye: 135 217 Forms the Wales-England border for much of its length. 3 River Teme: 81 130 Entirely in England after 12 miles (19 km). 4 River Usk: 78 126 [3] Longest river entirely in Wales according to some ...
The River Conwy (Welsh pronunciation:; Welsh: Afon Conwy) is a river in north Wales. From its source to its discharge in Conwy Bay it is 55 kilometres (34 mi) long and drains an area of 678 square km. [ 2 ] "Conwy" was formerly anglicised as "Conway."
The River Dyfi (Welsh: Afon Dyfi; Welsh pronunciation:), also known as the River Dovey (/ ˈ d ʌ v i / DUH-vee), is an approximately 30-mile (48-kilometre) long river in Wales. [ 1 ] Its large estuary forms the boundary between the counties of Gwynedd and Ceredigion , and its lower reaches have historically been considered the border between ...
Watershed delineation is the process of identifying the boundary of a watershed, also referred to as a catchment, drainage basin, or river basin.It is an important step in many areas of environmental science, engineering, and management, for example to study flooding, aquatic habitat, or water pollution.
The River Vyrnwy (Welsh: Afon Efyrnwy, pronounced [ɛˈvərnʊɨ]) flows through northern Powys, Wales, and Shropshire, England. The name derives from Severn , the river of which it is a tributary .
The River Teifi (English: / ˈ t aɪ v i / TY-vee; Welsh: Afon Teifi, pronounced [ˈavɔn ˈtɛivɪ]), [citation needed] formerly anglicised as Tivy, [4] [5] forms the boundary for most of its length between the Welsh counties of Ceredigion and Carmarthenshire, and for the final 3 miles (4.8 km) of its total length of 76 miles (122 km), the boundary between Ceredigion and Pembrokeshire.
The River Usk has played an important role in the history of Wales and features in some local folk-tales. Historically, the tidal reaches of the Usk have been used as a major shipping port for much of the last millennium, mostly because of its wide and deep mouth, and good navigable access from the Severn Estuary and the Bristol Channel and ...
The River Arrow (Welsh: Afon Arwy) is a river in the Welsh Marches, rising in Powys in Wales, then flowing into the English county of Herefordshire. [1]It rises near Gwaunceste Hill, then flows south-east through Newchuch and Michaelchurch-on-Arrow.