Kalajoki is a coastal town and municipality of Finland. It is located in the immediate vicinity of the Gulf of Bothnia in the province of Oulu and i…Kalajoki is a coastal town and municipality of Finland. It is located in the immediate vicinity of the Gulf of Bothnia in the province of Oulu and is part of the Northern Ostrobothnia region. The town has a population of 12,267 and covers an area of 2,391.30 square kilometres of which 1,469.15 km² is water. The population density is 13.27 inhabitants per square kilometre.