Wales' River Network: Approximately 60 Major Rivers Including Severn, Wye, and Dee

Wales, though compact (20,779 km²), possesses a dense network of rivers—about **60 principal rivers**—fed by high rainfall (up to 4,000 mm/year in Snowdonia) and glacial landforms. Most flow from the central uplands (Cambrian Mountains) radially to the sea.

Major Rivers (by length/catchment)

• River Severn (Afon Hafren): UK's longest river (354 km / 220 mi). Source: Plynlimon, Mid Wales. Flows through Shropshire, Worcestershire, Gloucestershire to Bristol Channel. Major for salmon, historic trade.
• River Wye (Afon Gwy): 250 km (155 mi). Source: Plynlimon. Forms England-Wales border. Wye Valley AONB. Famous for salmon, canoeing, Tintern Abbey.
• River Towy (Afon Tywi): 121 km (75 mi). Longest wholly in Wales. Carmarthen Bay. Sewin (sea trout) fishery.
• River Usk (Afon Wysg): 125 km (78 mi). Brecon Beacons to Newport. SAC for salmon, lamprey, shad.
• River Teifi (Afon Teifi): 122 km (76 mi). Tregaron Bog to Cardigan Bay. Otters, salmon, coracles.
• River Dee (Afon Dyfrdwy): 110 km (68 mi). Source: Snowdonia. Chester (England) estuary. Bala Lake (Llyn Tegid) source regulation.

Other Notable Rivers

• Tawe, Neath, Afan, Ogmore, Taff, Rhymney, Ebbw, Usk (South Wales Valleys—industrial heritage).
• Conwy, Clwyd, Dyfi, Mawddach, Dysynni (North Wales—steep, flashy).
• Cothi, Gwili, Loughor (Southwest).

Significance

Welsh rivers support biodiversity (Atlantic salmon, freshwater pearl mussel), hydropower, water supply (reservoirs: Llyn Brianne, Claerwen, Vyrnwy), recreation (angling, whitewater), and cultural identity (poetry, song, mythology). Many are Special Areas of Conservation (SAC) under EU/UK law.