Kerimäki is a municipality of Finland. It is located in the province of Eastern Finland and is part of the Southern Savonia region. The municipality has a population of 6,056 and covers an area of 875.55 km² of which 281.14 km² is water. The population density is 10,195 inhabitants per km². The municipality is unilingually Finnish. The Kerimäki Church, built between 1844 and 1847, is the biggest wooden church in the world (45 meters long, 42 meters wide and 37 meters high). There are over 3,000 seats there. Altogether there can be 5,000 people at a time in the church. Lake Puruvesi, which lies less than half a mile away from the church, is one of the clearest lakes in the world. The water is so pure, that you can freely drink straight from the lake.