River Severn

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The River Severn (Welsh: Afon Hafren, Latin: Sabrina) is the longest river in Great Britain, at about 354 kilometres (220 mi).[3][4] It rises at an altitude of 610 metres (2,001 ft) on Plynlimon near Llanidloes, Powys, 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 11,420 square kilometres (4,409 sq mi), excluding the River Wye and Bristol Avon which flow into the Bristol Channel. The major tributaries to the Severn are the Vyrnwy, Teme, Warwickshire Avon and Stour.

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