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.