Ostrobothnia is one of the two Finnish regions with a Swedish-speaking majority (the other being the constitutionally monolingual province of Åland); Swedish-speakers make up 51.2%. The region contains both bilingual municipalities and ones that are exclusively Finnish or Swedish-speaking.

Geographically, Ostrobothnia has little topographical relief, because it is mostly former seafloor brought to surface by post-glacial rebound and the accumulation of alluvial sediment. Ostrobothnia has both vast expanses of cultivated fields (lakeus) as in Southern Ostrobothnia, and the archipelago of Kvarken (Finnish: Merenkurkku). Glacial transport has deposited large quantities of glacial erratics (rocks) in the area. Like elsewhere in Pohjanmaa, rivers are a prominent part of the landscape. The major rivers that discharge into the Gulf of Bothnia in Ostrobothnia are Kyrönjoki, Lapuanjoki and Ähtävänjoki.

The regional tree is the black alder (Alnus glutinosa), the regional mammal is the common elk (Alces alces alces), the regional stone is the Vaasa granite and the regional song is "The march of Vaasa" (Swedish: Vasamarschen, Finnish: Vaasan marssi).

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Wikipedia