Vistula Lagoon million. However, major ecological considerations stand in the way. For example, mammal migration along the lagoon could be disrupted. Also, the inflow of brackish waters from the Baltic sea could result in serious unbalancing of the lagoon's freshwater ecosystem. From 1772 until 1918, the lagoon was part of the Kingdom of Prussia, which had become part of the German Empire in 1871. Between 1920 and 1946 it was split between Germany and the Free City of Danzig. At present state since 1945 its eastern part belongs to Russia (formerly USSR), Poland has 43.8% of its area at lagoon's western side.
Koggala Lagoon Koggala Lagoon Koggala Lagoon ()is a coastal waterbody located in Galle District,Southern Sri Lanka. It is situated near the town of Koggala and adjacent to the southern coast, about south of Colombo. The lagoon is embellished with eight ecologically rich small islands. The lagoon has a surface area of approximately measuring in length and in width. The water depth ranges from to . The lagoon is largely rain fed and a number of streams are connected to it. Warabokka-ela stream (Koggala-oya) that enters the lagoon from the north-west is the main freshwater supply. Kerena anicut, which was constructed combining two