Lake Superior the Soo Locks. Lake Superior is the largest freshwater lake in the world in area (if Lakes Michigan and Huron are taken separately; "see Lake Michigan–Huron"), and the third largest in volume, behind Lake Baikal in Siberia and Lake Tanganyika in East Africa. The Caspian Sea, while larger than Lake Superior in both surface area and volume, is brackish; though presently isolated, prehistorically the Caspian has been repeatedly connected to and isolated from the Mediterranean via the Black Sea. Lake Superior has a surface area of , which is approximately the size of South Carolina or Austria. It has a
Lake Wallenpaupack from Pennsylvania's list of impaired waters in 2016, twenty years after having been so designated. The lake is used as an educational resource to teach ecology to students of the Wallenpaupack Area School District. The Lake Wallenpaupack Watershed Management District (LWWMD) is a nonprofit organization started in 1979 and dedicated to improving the water quality of the lake. Lake Wallenpaupack Lake Wallenpaupack is a freshwater lake in northeastern 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 a surface area in excess of 5,700