The River Leven flows into the expansive tidal estuary of Morecambe Bay in Cumbria, England. This estuarine environment is characterized by extensive sandflats, mudflats, and saltmarsh, transitioning from the freshwater outflow of Windermere into a dynamic saltwater system. The area is part of a larger, complex coastal landscape that includes several major estuaries and is noted for its significant wildlife interest and scenic value. The Leven Estuary is a substantial feature within the Furness and Cartmel Peninsulas, often grouped under the "Lake District Peninsulas" designation.