Мста
Vyshny Volochyok Waterway () is a waterway connecting the basins of the Baltic and Caspian Seas, or, more specifically, the Msta River and the Tvertsa River, around the town of Vyshny Volochyok of Tver Oblast, Russia. It was constructed in the 1700s and became the first waterway to connect the basins of the two seas. The waterway is still in operation, though it was superseded by the Volga–Baltic Waterway and cannot take big ships. The Vyshny Volochyok Waterway is one of the three canal systems connecting the Neva and the Volga, the other two being the Volga–Baltic Waterway and the Tikhvinskaya water system.