Vistula Spit
The Vistula Lagoon (; , transliterated: "Kaliningradskiy Zaliv"; ; ) 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 the Gdańsk Bay by the Vistula Spit. The modern German name, "Frisches Haff", is derived from an earlier form, "Friesisches Haff".