The River Severn is part of the Waterways of Mainland Britain and is made up of the River Severn (upper river), the River Severn (main river), the River Severn (old river navigation), the River Severn (tidal section) and the River Severn (Maisemore Channel).
The navigational authority for this waterway is Canal & River Trust
Relevant publications — Waterway Maps:
- Waterway Routes 01M - England and Wales Map
- Waterway Routes 43M - River Severn and Gloucester and Sharpness Canal Map (Downloadable)
Relevant publications — Waterway Guides:
- Pearson's Canal Companion: Severn & Avon: Mid-Worcestershire Ring and Cotswold Canals (Saul-Sapperton)
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Wikipedia has a page about River Severn
The River Severn (Welsh: Afon Hafren, Latin: Sabrina) is the longest river in the United Kingdom, at about 220 miles (354 km). 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 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, Warwickshire Avon and Stour.