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.
Vistula Lagoon Century as Estmere. It is an Anglo-Saxon translation of Old Prussian name for the lagoon - *Aīstinmari (modern Lithuanian - Aistmarės) derived from (OP - Old Prussian) Aistei - "Ests", (LAT - Latin)"Aestii" etc. and (OP) *mari - "lagoon (a body of water cut off from a larger body by a reef of sand), fresh water bay". The Ests were Baltic people who since 9th Century became called in some historical sources (first time by Bavarian Geographer) Bruzi, Pruzzen, Pruteni etc. - Old Prussians. So the oldest known meaning of the name of Vistula Lagoon was "The lagoon or sea