The British Isles are home to many rivers, some of which are the Severn, AVON, Dee, Wye, Ouse, Trent, and Thames. The Severn is the longest river in Britain, stretching for 220 miles from its source in Wales to the Bristol Channel. The AVON is a tributary of the Severn, originating in Gloucestershire and flowing through Wiltshire and Somerset before joining the Severn near Bristol. The Dee is a river in North Wales that flows into the Irish Sea. The Wye is a river in Wales and England that flows into the Severn Estuary. The Ouse is a river in Yorkshire that flows into the North Sea. The Trent is a major river in England that flows through the Midlands and joins the River Ouse near Nottingham. Finally, the Thames is the longest river entirely in England, flowing for 215 miles from Gloucestershire to the North Sea.