For other rivers named "Severn", see Severn River. The River Severn (Welsh: Afon Hafren, Latin: Sabrina) is the longest river in Great Britain, at . It rises at an altitude of on Plynlimon near Llanidloes, in the Cambrian Mountains, Mid Wales, and it passes through a number of English counties, with the county towns of Shrewsbury, Worcester, and Gloucester located on its banks. With an average discharge of 107 m³/s at Apperley, Gloucestershire, the Severn is England's greatest river in terms of water flow, and is considered one of the ten major rivers of the United Kingdom. The river becomes the Severn Estuary after the Second Severn Crossing near Aust, Gloucestershire. 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 , excluding the River Wye and Bristol Avon which flow

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