High Quality Content by WIKIPEDIA articles Lake Winnipesaukee is the largest lake in the U.S. state of New Hampshire. It is approximately 21 miles (34 km) long (northwest-southeast) and from 1 to 9 miles (1.6 to 14 km) wide (northeast-southwest), covering 69 square miles (179 km2)-71 square miles (184 km2) when Paugus Bay is included-with a maximum depth of 212 feet (65 m).