Öja is an island in the Gulf of Bothnia

Gulf of Bothnia

The Gulf of Bothnia is the northernmost arm of the Baltic Sea. It is situated between Finland's west coast and Sweden's east coast. In the south of the gulf lie the Åland Islands, between the Sea of Åland and the Archipelago Sea.-Name:...

 in Kokkola

Kokkola

Kokkola is a town and municipality of Finland.The town is located in the province of Western Finland and is part of the Central Ostrobothnia region. The town has a population of and covers an area of of which is water. The population density is...

 (Karleby) municipality, Finland

Finland

Finland , officially the Republic of Finland, is a Nordic country situated in the Fennoscandian region of Northern Europe. It is bordered by Sweden in the west, Norway in the north and Russia in the east, while Estonia lies to its south across the Gulf of Finland.Around 5.4 million people reside...

. It has an area of 90 square kilometres (34.7 sq mi). Öja is also the name of a settlement on the island with a population of 800.

Öja was an independent municipality until 1969, when it was consolidated to Kaarlela. Kaarlela was consolidated to Kokkola in 1977.