Vistula Lagoon

German  Frisches Haff , Polish  Zalew Wislany , Russian  Vislinsky Zaliv  shallow, marsh-fringed lagoon on the Baltic coast, bisected by the Polish-Russian border and considered part of the Gulf of Gdansk. Covering 330 square miles (855 square km), it is 56 miles (90 km) long, 6 to 15 miles (10 to 19 km) wide, and up to 17 feet (5 m) deep. The Nogat, the eastern distributary of the Vistula River delta, is the principal river entering the lagoon. The long, narrow Vistula Spit protects the