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.
Jocks Lagoon Jocks Lagoon Jocks Lagoon is an freshwater coastal lagoon in north-eastern Tasmania, Australia. In 1982 it was designated a wetland of international importance under the Ramsar Convention. The lagoon is located approximately south-east of the town of St Helens. It lies partly on private land and partly at the southern end of the St Helens Point conservation area. One of a chain of wetlands along St Helens Point, it is inland from the coast, near a dunefield. About long and wide, it is dystrophic, with tannin-stained, low-nutrient, acidic waters. Water levels fluctuate with rainfall and reach a depth of .