What type river is the river severn river?

The River Severn (Welsh: Afon Hafren, Latin: Sabrina) is the longest river in the United Kingdom, at about 354 kilometres (220 mi),34 and the second longest in the British Isles, behind the River Shannon. It rises at an altitude of 610 metres (2,001 ft) on Plynlimon, Ceredigion 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 Severn Estuary. The major tributaries to the Severn are the Vyrnwy, Teme, Warwickshire Avon and Stour. The name Severn is thought to derive from a Celtic original name *sabrinn-â, of uncertain meaning.

5 That name then developed in different languages to become Sabrina to the Romans, Hafren in Welsh, and Severn in English. A folk etymology later developed, deriving the name from a mythical story of a nymph, Sabrina, who drowned in the river. 6 Sabrina is also the goddess of the River Severn in Brythonic mythology.

The story of Sabrina is featured in Milton's Comus. 7 There is a statue of 'Sabrina' in the Dingle Gardens at the Quarry, Shrewsbury. As the Severn becomes tidal the associated deity changed to Noadu (Romanized as Nodens), who was represented mounted on a seahorse, riding on the crest of the Severn bore.

The River Stour rises in the north of Worcestershire in the Clent Hills, near St Kenelm's Church at Romsley. It flows north into the adjacent West Midlands at Halesowen. It then flows westwards through Cradley Heath and Stourbridge where it leaves the Black Country.