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.
Logan Lagoon Lady Barron. It is isolated from the sea by a large sand bar which is infrequently breached by either high water levels in the lagoon or by rough seas eroding the bar. The water in the lagoon is generally 1–2 m deep and fluctuates with rainfall, occasionally drying out. The 75 km catchment of the lagoon is mainly agricultural land. The eastern side of the lagoon has a dense coastal shrubland of coast wattle and coast tea-tree interspersed with grassy patches. Where the land is largely protected from bushfires there is a mixture of forest and scrub dominated by Smithton