a bay on the Baltic Sea, bordered by the German Democratic Republic (GDR) and the Federal Republic of Germany (FRG). Length, 80 km; width, about 50 km at the entrance; depth, 27 m.
The bay freezes over in severe winters. The tides are semidiurnal, about 0.2 m at the maximum. Ports on Mecklenburg Bay include Warnemiinde, Rostock, and Wismar (GDR) and Lii-beck and Neustadt (FRG).