Lake Peipus Lake Peipus Lake Peipus (; ; ) is the largest transboundary lake in Europe, lies on the border between Estonia and Russia. The lake is the fifth-largest in Europe after Lake Ladoga and Lake Onega (in Russia north of St. Petersburg), Lake Vänern (in Sweden), and Lake Saimaa (in Finland). Lake Peipus represents a remnant of a body of water which existed in this area during an Ice Age. It covers , and has an average depth of , the deepest point being . The lake has several islands and consists of 3 parts: The lake is used for fishing
Lake Onega Volga River, Caspian Sea and Black Sea. The Onega Canal, which follows the southern banks of the lake, was built in 1818–1820 and 1845–1852 between Vytegra River in the east and Svir River in the west. The canal was part of the Mariinsk Canal System, a forerunner of the Volga–Baltic Waterway, and aimed to create a quiet pass for boats avoiding the stormy waters of the lake. It is around wide, and lies between and from the shores of the lake. The canal is not used for active navigation at present. There are about 1650 islands in the lake with