Lake Pend Oreille is a lake in the northern Idaho Panhandle, with a surface area of 148 square miles. It is 65 miles (105 km) long, and 1,150 feet (350 m) deep in some regions, making it the fifth deepest in the United States. It is fed by the Clark Fork River and the Pack River, and drains via the Pend Oreille River.
