England's Great Ouse River is a major river in the United Kingdom. It is the longest river entirely in England, with a length of about 230 miles. The river rises in the county of Northamptonshire and flows through several counties before entering the North Sea at The Wash. Along its course, it passes through the cities of Bedford, Huntingdon, St Ives, Ely, and King's Lynn. The Great Ouse is an important habitat for wildlife, and is also used for recreational activities such as fishing and boating.