Vistula Lagoon 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. It is now known as the Vistula Bay or Vistula Gulf. The modern German name, "Frisches Haff", is derived from an earlier form, "Friesisches Haff". The lagoon is a mouth of a few branches of the Vistula River, notably the Nogat, and the Pregolya River. It is connected to
Muthupet Lagoon mangrove forest is divided into Palanjur reserve forest, Thamarankottai reserve forest, Maravakkadu reserve forest, Vadakadu reserve forest, Thuraikadu reserve forest and Muthupet reserve forest. The word 'lagoon' refers to the shallow salt or brackish water body that lies close to the sea. Muthupet reserve forest covers the lagoon, river creeks and the mudflats. Muthupet (mullipallam) Lagoon is a spectacular natural creation, which is 8 km from nearby Muthupet town and can be reachable only by boat. The lagoon is shallow with the average of 1m depth. The bottom of the lagoon is formed of silt clay substratum. The tidal fluctuations