- a sea in N Europe, bounded by Denmark, Sweden, Finland, Estonia, Latvia, Lithuania, Poland, and Germany. About 160,000 sq. mi. (414,000 sq. km).
- a sea in N Europe, connected with the North Sea by the Skagerrak, Kattegat, and Öresund; shallow, with low salinity and small tides
Sea in Europe bordered by Russia, Estonia, Latvia, and Lithuania to the east, Germany and Poland to the south, and Scandinavia to the north and west; connected to several large gulfs and to the North Sea by straits around Denmark.