The Duddon is a significant tidal estuary system on the Cumbrian coast, forming a broad transition zone between the Irish Sea and the western Lake District fells. It is bordered by the Furness peninsula to the east and opens to the sea to the south, with its upper tidal reaches extending into the scenic and isolated Duddon Valley. This water body is a mix of expansive mudflats, saltmarsh, and channels, influenced by the strong tidal flows of Morecambe Bay. The surrounding area is characterized by historic market towns like Broughton-in-Furness, which serve as gateways to this quieter part of the Lake District National Park. The estuary is a dynamic marine environment, remote from industrial centers, offering anglers a blend of coastal and estuarine fishing opportunities amidst a landscape celebrated for its natural beauty.