Petäjävesi (Finnish pronunciation: [ˈpetæjæˌʋesi]; lit. "pine water") is a municipality of Finland. It is located in the province of Western Finland, next to the city of Jyväskylä, and is part of the Central Finland region. The municipality has a population of 3,760 (31 March 2021) and covers an area of 495.41 square kilometres (191.28 sq mi) of which 39.01 kmÂ² (15.06 sq mi) is water. The population density is 8.24 inhabitants per square kilometre (21.3/sq mi).