Mohegan Lake is located at 41°19′7″N 73°50′53″W﻿ / ﻿41.31861°N 73.84806°W﻿ / 41.31861; -73.84806 (41.318568, -73.848029). According to the United States Census Bureau, the CDP has a total area of 3.1 square miles (8.0 km2), of which 2.9 square miles (7.5 km2) is land and 0.2 square miles (0.52 km2), or 5.52%, is water.[19]