Lake Sunapee is located within Sullivan County and Merrimack County in western New Hampshire, the United States. It is the fifth-largest lake located entirely in New Hampshire. The lake is approximately 8.1 miles long and from 0.5 to 2.5 miles wide, covering 6.5 square miles, with a maximum depth of 105 feet. It contains eleven islands and is indente…Lake Sunapee is located within Sullivan County and Merrimack County in western New Hampshire, the United States. It is the fifth-largest lake located entirely in New Hampshire. The lake is approximately 8.1 miles long and from 0.5 to 2.5 miles wide, covering 6.5 square miles, with a maximum depth of 105 feet. It contains eleven islands and is indented by several peninsulas and lake fingers, a combination which yields a total shoreline of some 70 miles. There are seven sandy beach areas including Mount Sunapee State Park beach; some with restricted town access. There are six boat ramps to access the lake at Sunapee Harbor, Georges Mills, Newbury, Mount Sunapee State Park, Burkehaven Marina, and a private marina. The lake contains three lighthouses on the National Register of Historic Places. The driving distance around the lake is 25 miles with many miles of lake water view. The lake is 1,093 feet above sea level.
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