Gulf of Bothnia

Not to be confused with the Gulf of Boothia.
"Bothnia" redirects here. For other uses, see Bothnia (disambiguation).

Map of the Baltic Sea, showing the Gulf of Bothnia in the upper half
Satellite image of Fennoscandia in winter. The northern part of the Gulf of Bothnia, the Bothnian Bay, is covered with sea ice.

The Gulf of Bothnia (/ˈbɒθniə/; Finnish: Pohjanlahti; Swedish: Bottniska viken) is divided into the Bothnian Bay and Bothnian Sea, and it is the northernmost arm of the Baltic Sea, between Finland's west coast (East Bothnia) and the northern part of Sweden's east coast (West Bothnia and North Bothnia). In the south of the gulf lies Åland, between the Sea of Åland and the Archipelago Sea.