Lake Wallenpaupack is a freshwater lake in Pennsylvania. It is the third largest lake in Pennsylvania measuring 52 miles of shoreline, 13 miles in length, 60 feet deep at points, and has in excess of 5,700 acres of surface water. It was created in 1926 by PPL, the Pennsylvania Power & Light Company, for hydroelectric purposes as well as flood control; however, it is best known as one of several major recreational destinations in the Pocono Mountains.