Northamptonshire is a county in England, and it is home to three rivers: the Ouse, the Cherwell, and the NENE. The Ouse is a tributary of the Great Ouse, which flows into the North Sea. The Cherwell is a tributary of the River Thames, which also flows into the North Sea. The NENE is the longest river in the county, and it flows into the Wash, an estuary on the east coast of England. All three rivers are important sources of water for the county and its inhabitants.