Key Facts About the River Severn
- Length: 220 miles (354 km)—longest river in Great Britain.
- Source: Slopes of Plynlimon in the Cambrian Mountains, Wales.
- Mouth: Severn Estuary into Bristol Channel/Atlantic Ocean near Bristol.
- Major Tributaries: River Avon, River Teme, River Wye.
- Estuary: Largest in Great Britain (~500 sq mi / 1,300 km²).
- Tidal Range: Among world's highest—up to 50 ft (15 m) difference.
- Bridges: Severn Bridge, Second Severn Crossing, M48 Severn Bridge.
- History: Centuries-old waterway for transport, trade, fishing, and watermill power.
- Wildlife: Salmon, trout, bass, eel; herons, egrets, osprey.
- Conservation: Protected as Severn Estuary SAC and River Severn SSSI.
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