Afon Hafren
| River Severn | |
| Welsh: Afon Hafren, Latin: Sabrina | |
| River | |
 The Severn at Shrewsbury from Shrewsbury Castle.
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| Countries | United Kingdom, (Wales, England) |
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| Regions | Mid Wales, West Midlands, South West |
| Counties | Powys, Shropshire, Worcestershire, Gloucestershire |
| Tributaries | |
| - left | Vyrnwy, Tern, Stour, Warwickshire Avon, Bristol Avon |
| - right | Teme, Leadon, Wye |
| Cities | Shrewsbury, Worcester, Gloucester, Bristol |
| Landmarks | Ironbridge Gorge, Severn Valley, Severn bore, Severn crossing |
| Source | |
| - location | Plynlimon, Ceredigion, Wales |
| - elevation | 610 m (2,001 ft) |
| - coordinates | 52°29′36″N 3°44′04″W / 52.493465°N 3.734578°W |
| Mouth | Severn Estuary |
| - location | Bristol Channel, United Kingdom |
| - elevation | 0 m (0 ft) |
| Length | 354 km (220 mi) |
| Basin | 11,420 km2 (4,409 sq mi) |
| Discharge | for Bewdley, Worcs. SO 7815 7622 |
| - average | 61.17 m3/s (2,160 cu ft/s) |
| - max | 533.48 m3/s (18,840 cu ft/s) max recorded on 1947-03-21 |
| Discharge elsewhere (average) | |
| - Apperley, Glos. | 107 m3/s (3,779 cu ft/s) |
| - Montford, Shrops. | 43.46 m3/s (1,535 cu ft/s) |
 Tributaries (light blue) and major settlements on and near the Severn (bold blue)
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The River Severn (Welsh: Afon Hafren, Latin: Sabrina) is a river in the United Kingdom. At about 220 miles (354 km), it is usually considered to be the longest in the UK. It rises at an altitude of 2,001 feet (610 m) on Plynlimon, close to the Ceredigion/Powys border near Llanidloes, in the Cambrian Mountains of mid Wales. It then flows through Shropshire, Worcestershire and Gloucestershire, with the county towns of Shrewsbury, Worcester and Gloucester on its banks. With an average discharge of 107 m3/s (3,800 cu ft/s) at Apperley, Gloucestershire, the Severn is the greatest river in terms of water flow in England and Wales.
The river is usually considered to become the Severn Estuary after the Second Severn Crossing between Severn Beach, South Gloucestershire and Sudbrook, Monmouthshire. The river then discharges into the Bristol Channel which in turn discharges into the Celtic Sea and the wider Atlantic Ocean. The Severn's drainage basin area is 4,409 square miles (11,419 km2), excluding the River Wye and Bristol Avon which flow into the Severn Estuary. The major tributaries to the Severn are the Vyrnwy, Clywedog, Teme, Avon and Stour.
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