Ranua is a municipality of Finland. It is located in the province of Lapland. The municipality has a population of 3,571 and covers an area of 3,6…Ranua is a municipality of Finland. It is located in the province of Lapland. The municipality has a population of 3,571 and covers an area of 3,694.79 square kilometres of which 241.09 km² is water. The population density is 1.03 inhabitants per square kilometre.