Major Rivers of the UK: By Country

The UK's rivers are relatively short but historically, economically, and ecologically vital. Organized by constituent country:

England

• Thames (346 km) – London, tidal to Teddington
• Severn (354 km) – UK's longest; Wales → England → Bristol Channel
• Trent (297 km) – Midlands, tidal to Newark
• Great Ouse (230 km) – East Anglia fen drainage
• Tyne (118 km) – Newcastle, industrial heritage
• Mersey (112 km) – Liverpool, Merseybeat
• Exe (96 km) – Devon, Exeter
• Avon (multiple: Warwickshire, Bristol, Hampshire)
• Cam (Cambridge), Humber (estuary), Derwent (multiple)

Scotland

• Tay (188 km) – Largest discharge, salmon
• Clyde (171 km) – Glasgow, shipbuilding
• Spey (172 km) – Whisky, salmon
• Tweed (156 km) – Border, salmon
• Forth (105 km) – Edinburgh, bridges
• Dee (137 km) – Aberdeen, royal
• Don (132 km) – Aberdeen

Wales

• Severn (source in Plynlimon)
• Wye (250 km) – Border, scenic
• Tywi (121 km) – Coracles, sea trout
• Teifi (122 km) – Cardigan Bay
• Dee (113 km) – Bala Lake, Chester
• Conwy, Ogmore, Ebbw, Taff (Cardiff), Usk

Northern Ireland

• Bann (129 km) – Lough Neagh outflow
• Foyle (129 km) – Derry/Londonderry border
• Lagan (86 km) – Belfast
• Mourne (mountains, not river—likely River Mourne in Co. Down)

Shared/Notable

• Severn & Wye cross England/Wales
• Tweed crosses Scotland/England
• Dee appears in both Scotland & Wales (different rivers)