An arm of the Baltic Sea between southern Finland and northwest U.S.S.R. An important shipping lane, the shallow gulf is usually frozen from December to March.

• 芬兰湾：波罗的海的一个港湾，位于芬兰南部和苏联西北之间。是一个重要的船港，该港湾从十一月到三月间通常是冰封的