River Severn: The Longest River in the United Kingdom
The River Severn (Welsh: Afon Hafren) is the longest river in the UK at 354 km (220 miles).
Course & Geography
- Source: Plynlimon (Pumlumon), Cambrian Mountains, mid-Wales (620 m / 2,030 ft)
- Direction: Northeast → East → South through Wales and England
- Major towns: Llanidloes, Welshpool, Shrewsbury, Ironbridge, Bridgnorth, Stourport, Worcester, Tewkesbury, Gloucester
- Mouth: Severn Estuary → Bristol Channel (near Avonmouth)
- Tidal limit: Maisemore Weir (Gloucester) — 30 km from sea
Key Statistics
| Measure | Value |
|---|
| Length | 354 km (220 mi) |
| Basin area | 11,420 km² (4,410 mi²) |
| Average flow | 107 m³/s (at Bewdley) |
| Max flow | 1,500+ m³/s (floods) |
| Tidal range | Up to 15 m (2nd highest in world) |
Major Tributaries
- Left bank: Vyrnwy, Tern, Stour, Teme, Warwickshire Avon
- Right bank: Clywedog, Perry, Worfe, Leadon
Historical & Economic Significance
- Ironbridge Gorge: Birthplace of Industrial Revolution (first iron bridge, 1779)
- Navigation: Canalized sections, locks (Stourport to Gloucester)
- Severn Bore: Tidal surge wave (up to 2 m) — surfing attraction
- Fisheries: Salmon (historic), elvers, coarse fish
- Water supply: Major abstraction for Midlands, Bristol
Comparison to Other UK Rivers
| River | Length (km) | Length (mi) | Country |
|---|
| Severn | 354 | 220 | Wales/England |
| Thames | 346 | 215 | England |
| Trent | 297 | 185 | England |
| Wye | 250 | 155 | Wales/England |
| Great Ouse | 230 | 143 | England |
Environmental Challenges
- Nutrient pollution (agriculture, sewage)
- Barriers to fish migration (weirs, dams)
- Flood risk (Shrewsbury, Worcester, Gloucester)
- Climate change: lower summer flows, extreme floods
The Severn's Welsh source and English course make it a transboundary river central to western Britain's geography and history.
Wanderlust World