This is the River Severn, the longest river in the UK ... gorges and valleys. The middle part of a river is on lower ground. Some streams and smaller rivers feed into it and they are called ...

The Severn swiftly grows and forms a V-shaped valley. The river transports a large load, which allows rapid erosion to take place. Waterfalls and gorges have been formed in the upper course.

Kevin Brady, 32, of Gloucester, aims to conquer the waterway, from its source in the mountains of mid Wales to the Severn Estuary, for charity. The river is 220 miles (350 km) long and has the ...