The Vistula Lagoon (Polish: Zalew Wiślany; Russian: Калининградский залив or Kaliningradskiy Zaliv; German: Frisches Haff; Lithuanian: Aistmarės) is a brackish water lagoon on the Baltic Sea roughly 56 miles (90 km) long, 6 to 15 miles (10 to 19 km) wide, and up to 17 feet (5 m) deep, separated from Gdańsk Bay by the Vistula Spit. It is now known as the Vistula Bay or Vistula Gulf.