The River Severn is the longest river in the United Kingdom, stretching about 220 miles (354 kilometers). It flows through Wales and England, starting in the Cambrian Mountains and emptying into the Bristol Channel. The river is known for its tidal range, which is one of the largest in the world. The River Severn passes through several cities, including Shrewsbury, Worcester, and Gloucester. It supports diverse wildlife and is an important habitat for various species. The river also plays a significant role in local history and culture, with numerous bridges and landmarks along its banks.