Eastern arm of the
Baltic Sea, separating Finland from Estonia. It is
c. 460 km/285 mi long and
c. 16130 km/1080 mi wide. Helsinki, Tallinn (Estonia), and St Petersburg are the main ports. The gulf is an important corridor for Russian and Estonian shipping.
Fresh water from Finnish lakes, and from the lakes of Onega and Ladoga via the River Neva, contributes to the very low salinity levels in the gulf. The surface freezes over in winter, linking many small Finnish islands to the mainland.
© RM 2009. Helicon Publishing is division of RM.