Question: 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? 
Sentence (from "Humber"): Although the Humber is an estuary from the point at which it is formed, many maps show it as the River Humber.
Relevant evidence: No