Ostrobothnia refers to various areas in Finland: *

Ostrobothnia (historical province) Ostrobothnia (; ) is a historical province comprising a large portion of western and northern Finland. Before the Treaty of Fredrikshamn in 1809, Ostrobothnia was part of Sweden. It is bounded by Karelia, Savonia (historical province), Savo, ...

, a traditional region () of Finland *

Ostrobothnia County Ostrobothnia County (, ) was a county of the Swedish Empire The Swedish Empire or the Great Power era () was the period in Swedish history spanning much of the 17th and early 18th centuries during which Sweden became a European great power ...

, a county () of the Kingdom of Sweden in 1634–1775 * Modern regions () in Finland: **

Ostrobothnia (administrative region) Ostrobothnia (; ) is a regions of Finland, region in Western Finland, western Finland. It borders the regions of Central Ostrobothnia, South Ostrobothnia, and Satakunta. It is one of six regions that together form Ostrobothnia (historical provin ...

, coastal part of historical Ostrobothnia **

South Ostrobothnia South Ostrobothnia ( ; ) is one of the 19 regions of Finland. It borders the regions of Ostrobothnia, Central Ostrobothnia, Central Finland, Pirkanmaa, and Satakunta. Among the Finnish regions, South Ostrobothnia is the ninth largest in terms ...

Central Ostrobothnia Central Ostrobothnia (; ) is a Regions of Finland, region in Finland. Central Ostrobothnia borders the Bothnian Bay and the regions of Ostrobothnia (administrative region), Ostrobothnia, North Ostrobothnia, Central Finland and South Ostrobothnia ...

North Ostrobothnia North Ostrobothnia (; ) is a Regions of Finland, region of Finland. It borders the Finnish regions of Lapland (Finland), Lapland, Kainuu, Northern Savonia, North Savo, Central Finland and Central Ostrobothnia, as well as the Russian Republic of ...

See also