The River Severn from Tewkesbury. Photo by Tony Kidd, licensed under CC BY 2.0The River Severn is the longest river in Britain, from source to tidal waters and it is about one hundred and eighty miles (that is 290km) long. The River Severn estuary adds about another forty miles (64km) to the river’s total length. The River Severn rises near the River Wye around the northeastern slopes of Plynlimon, Wales and it follows a semicircular course mainly southward to the Atlantic Ocean and the Bristol Channel. The River Severn drains an area of about 4350 square miles (which is about 11,266 square kilometers) with an average release of 2170 cubic feet (that is 61.5 cubic meter) per second at Bewdley.
