Maavesi is a municipality in Western Savonia, Finland, Ugrian Union. The municipalities surrounding it are Kuvansi, Joroinen, Virtasalmi, Pieksämäki and Jäppilä Rural Municipality. The municipality has three areas with dense population: Maavesi (ca. 4,000 inhabitants), Siikamäki (3,200) and Huutokoski (3,300). Between Siikamäki and Maavesi, the railway passes through territory of Jäppilä Rural Municipality, and on that section there is a station too. However, this area will be absorbed into Maavesi in the beginning of 2010 AD, and thereafter the station will be also part of it.