Baltic Sea, arm of the North Atlantic Ocean, extending northward from the latitude of southern Denmark almost to the Arctic Circle and separating the Scandinavian Peninsula from the rest of continental Europe. It is the largest expanse of brackish water
Arctic Circle; its major axis, from eastern Denmark to southernFinland, is a little more than 1,000 miles (1,600 km) long, with an average width of about 120 miles (190 km). The western Baltic extends north throughinsularDenmark and includes theKattegat, a strait separating peninsular ...
The Baltic proper stretches southwest-northeast on the eastern side of the Scandinavian Peninsula from latitude 54° N to very near the Arctic Circle; its major axis, from eastern Denmark to southern Finland, is a little more than 1,000 miles (1,600 km) long, with an average width of ...