Szczecin Lagoon Szczecin Lagoon Szczecin Lagoon, Stettin Lagoon, Bay of Szczecin, or Stettin Bay (, ), also Oder lagoon (), is a lagoon in the Oder estuary, shared by Germany and Poland. It is separated from the Pomeranian Bay of the Baltic Sea by the islands of Usedom and Wolin. The lagoon is subdivided into the "Kleines Haff" (, "small lagoon") in the West and the "Wielki Zalew" (, "great lagoon") in the East. An ambiguous historical German name was "Frisches Haff", which later exclusively referred to the Vistula Lagoon. From the South, the lagoon is fed by several arms of the
Rodeo Lagoon throughout the summer algae bloom. The lagoon is located within the geologically complex Marin Headlands and fills a valley drowned by recent sea level rise following the last glacial period. The bed of the lagoon is covered by viscous black mud that is high in organic content, except at the east and west ends, where non-organic sediment can be found. Rodeo Lagoon was mostly unaltered until the area was developed by the U.S. military into Fort Cronkhite and Fort Barry In 1937, the Army constructed a road crossing at the east of the lagoon, which resulted in a reduction in