Karstula is a municipality of Finland.
It is located in the province of Western Finland and is part of the Central Finland region. The municipality has a population of 4,904 (2003) and covers an area of 963.45 km² of which 73.69 km² is water. The population density is 5.1 inhabitants per km².
It was founded in 1867.
A number of historical buildings (from the beginning of the 20th century) has been preserved in the village centre, representing the original countryside buildings of the region.
There's also a cottage designed by Alvar Aalto, though it hasn't been listed in most Aalto's biografies.
Alfred