An arm of the Atlantic Ocean in northern Europe bounded by Denmark, Sweden, Finland, Estonia, Latvia, Lithuania, Poland, and Germany. It opens to the North Sea via channels and canals, is mostly shallow, with relatively low salinity, and often freezes for three to five months of the year. the Baltic Sea the Baltic a sea that is part of the Atlantic Ocean and is surrounded by Denmark, Sweden, the Baltic States, and Poland. Sea, northern Europe. An arm of the Atlantic Ocean, connecting with the North Sea, it is 1,056 mi (1,699 km) long, covers an area of 163,050 sq mi (422,300 sq km), and has a maximum depth of 1,539 ft (469 m). It receives the Vistula and Oder rivers and many other rivers. It is enclosed by Denmark, Sweden, Finland, Estonia, Latvia, Lithuania, Poland, and Germany. It has two large arms, the Gulf of Bothnia and the Gulf of Finland. The modifying effect of the North Atlantic Current is scarcely felt; its waters contain only about one-fourth as much salt as the oceans, and it freezes readily
sea in Northern Europe surrounded by Northern European and Scandinavian countries (specifically: Denmark, Germany, Poland, Lithuania, Russia, Latvia, Estonia,Finland, and Sweden)