Massawepie Lake is located in the Adirondack Mountains of New York State, U.S., and a Boy Scout camp surrounding the lake. Lake Massawepie is located in the town of Piercefield, in southern St. Lawrence County, New York, approximately 12 miles (19 km) southwest of the village of Tupper Lake, New York. The lake is approximately 750 acres (3.0 km²), at an elevation of approximately 1700 feet (520 m) above sea level, and flows south into one of the tributaries of the Grasse River.