region, administrative county of Cumbria, historic county of Lancashire, England. Except for a narrow coastal plain, Furness is predominantly upland, with such eminences as the Old Man of Coniston and Wetherlam. Principal rivers are the Duddon, Leven (draining Windermere), and Crake (draining Coniston Water), flowing south into Morecambe Bay on the Irish Sea coast. Between the Duddon estuary and Morecambe Bay is a peninsula, off which lies the Isle of Walney, 8 miles (13 km) long and 1 mile wide. Much of Furness is in the Lake District, and Roudsea Wood is a nature reserve.
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