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.The largest expanse of brackish water in the world, the semienclosed and relatively shallow Baltic Sea is of great interest to scientists, while to historians it represents the economic ...

波罗的海是北欧重要航道，也是俄罗斯与 欧洲 贸易 的重要通道，是沿岸国家之间以及通往 北海 和北 大西洋 的重要水域，从 彼得大帝 时期起，波罗的海就是俄罗斯通往欧洲的重要出口。