Vistula Lagoon
The Vistula Lagoon ( ; or "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 Gdańsk Bay by the Vistula Spit . 
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