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.
Tortuguero Lagoon Tortuguero Lagoon Laguna Tortuguero Natural Reserve is a natural reservoir located between the municipalities of Vega Baja and Manatí in Puerto Rico. The lagoon is one of only two natural reservoirs in the island of Puerto Rico (the other being Joyuda Lagoon), and is home to an ample variety of species. Tortuguero Lagoon Nature Reserve is the only freshwater lagoon in Puerto Rico. It contains about 708 million gallons of water. The reserve was designated in 1979 through a program of Coastal Zone Management PR. It is located between the municipalities of Vega Baja and Manatí. It covers approximately 2.43