The 14 municipalities of the Ostrobothnia Region (Swedish: Österbotten; Finnish: Pohjanmaa) in Finland are divided into four sub-regions.
Both their location and the dominant language imply these divisions; Kyrönmaa, for example, is Finnish-speaking, whereas the others have Swedish-speakers in the majority.
Most places have both Swedish and Finnish names.
Media related to Municipalities in Ostrobothnia at Wikimedia Commons