The River Swale is a river in Yorkshire, and a major tributary of the River Ure, which itself becomes the River Ouse, emptying into the North Sea via the Humber, a large tidal estuary on the east coast of which country in the Northern region? 
River Swale: The River Swale is a river in Yorkshire, England and a major tributary of the River Ure, which itself becomes the River Ouse, emptying into the North Sea via the Humber Estuary. Humber: The Humber is a large tidal estuary on the east coast of Northern England.
England