Caspian Sea of around 149,200 square miles (386,400 square km)— bigger than the region of Japan—and its surface lies somewhere in the range of 90 feet (27 meters) below sea level. The sea bed in the southern part reaches as low as 1,023 m (3,356 ft) below sea level, which is the second lowest natural depression on earth after Lake Baikal (−1,180 m, −3,871 ft). The ancient inhabitants of its coast perceived the Caspian Sea as an ocean, probably because of its saltiness and large size. The sea has a surface area of 371,000 km (143,200 sq mi) (not including the detached
Philadelphia lakes in Franklin Delano Roosevelt Park, and Cobbs, Wissahickon, and Pennypack creeks. The largest artificial body of water is the East Park Reservoir in Fairmount Park. The lowest point is sea level, while the highest point is in Chestnut Hill, about above sea level on Summit Street near the intersection of Germantown Avenue and Bethlehem Pike (example coordinates near high point: 40.07815 N, 75.20747 W). Philadelphia is situated on the Fall Line that separates the Atlantic coastal plain from the Piedmont. The rapids on the Schuylkill River at East Falls were inundated by the completion of the dam at the