Isojoki

Isojoki (; lit. "Big River") is a municipality of Finland. It is part of the South Ostrobothnia region. The city of Pori is located south of Isojoki. Neighbouring municipalities are Honkajoki, Karijoki, Kauhajoki, Kristinestad, Merikarvia and Siikainen. The population of Isojoki is (). The municipality covers an area of , of which is inland water (). The population density is . The municipality is unilingually Finnish.