Chautauqua Lake is located entirely within Chautauqua County, New York, USA. The lake is approximately 17 miles (27 km) long and 2 miles (3.2 km) wide at its greatest width. The surface area is approximately 13,000 acres (53 km2). The maximum depth is about 78 feet (23 m). The shoreline is about 41.1 miles (66 km) of which all but 2.6 mi (4 km) are privately owned.