It is located in the province of Western Finland and is part of the Central Finland region. The municipality has a population of 4,746
(30 June 2015) and covers an area of 1,066.42 square kilometres (411.75sqmi) of
which 199.25km (76.93sqmi)
is water. The population density is
5.47 inhabitants per square kilometre (14.2/sqmi).