Cartmel Peninsula is a peninsula in Cumbria in England. It juts in a southerly direction into Morecambe Bay, bordered by the estuaries of the River Leven to the west and the River Winster to the east. It is, along with the Furness Peninsula, one of the two areas of that formed Lancashire North of the Sands, and the better known 'Furness' is often used to describe both peninsulae together. To its north, the peninsula's borders are usually given as the banks of Windermere and the border with the historic county of Westmorland between the Lake and the head of the Winster.