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 "River Nidd"): The Yorkshire Dales Rivers Trust YDRT has a remit to conserve the ecological condition of the River Nidd from its headwaters to the Humber estuary.
Relevant evidence: No