Ullswater is a glacial lake in Cumbria, England and part of the Lake District National Park. It is the second largest lake in the region by both area and volume, after Windermere. The lake is about 7 miles long, 0.75 miles wide, and has a maximum depth of 63 metres. Its outflow is River Eamont, which meets the River Eden at Brougham Castle before flowing into the Solway Firth. The lake is in the administrative county of Westmorland and Furness and the ceremonial county of Cumbria.