Lumijoki (meaning "Snow River") is a municipality of Finland.
It is located in the Northern Ostrobothnia region. The municipality has a population of 2,083 (30 June 2015) and covers an area of 290.29 square kilometres (112.08 sq mi) of which 77.1 km2 (29.8 sq mi) is water. The population density is 9.77 inhabitants per square kilometre (25.3/sq mi).
The municipality is unilingually Finnish.
Media related to Lumijoki at Wikimedia Commons