It is located in the province of Western Finland and is part of the Satakunta region. The municipality has a population of 3,327
(31 March 2016) and covers an area of 861.20 square kilometres (332.51sqmi) of
which 692.13km (267.23sqmi)
is water. The population density is
19.68 inhabitants per square kilometre (51.0/sqmi).