The district also extends to the tidal waters of Morecambe Bay and several of its estuaries alongside the Furness and Cartmel Peninsulas, designated on M6 motorway signposts as the "Lake District Peninsulas", and the southern portions of which lie outside the park. These are the Duddon Estuary, the Leven Estuary, and the western banks and tidal flats of the Kent Estuary. These areas are each characterised by sand and mudflats of scenic and wildlife interest. The coast is backed by extensive flats of raised marine deposits left when the relative sea level was higher.
The district also extends to the tidal waters of Morecambe Bay and several of its estuaries alongside the Furness and Cartme,l Peninsulas, desig.nated on M6 motorway signposts as the "Lake District Peninsulas" and the southern portions of which lie outside the park. These are the Duddon Estuary, the Leven Estuary, and the western banks and tidal flats of the Kent Estuary. These areas are each characterised by sand and mudflats of scenic and wildlife interest The coast is backed by extensive flats of raised marine deposits left when the relative sea level was higher.