Pertunmaa is a municipality of Finland located in the Southern Savonia region. The municipality has a population of 1,577 and covers an area of 454.20 square kilometres (175.37 sq mi) of which 79.7 km2 (30.8 sq mi) is water. The population density is 4.21 inhabitants per square kilometre (10.9/sq mi).

Hartola is a municipality of Finland. It is located in the Itä-Häme, Päijänne Tavastia region. The municipality has a population of 2,531 (31 December 2023), which make it the smallest municipality in Päijänne Tavastia in terms of population. It covers an area of 675.38 square kilometres (260.77 sq mi) of which 132.18 km2 (51.03 sq mi) is water. The population density is 4.66 inhabitants per square kilometre (12.1/sq mi). Neighbouring municipalities are Heinola, Joutsa, Luhanka, Pertunmaa and Sysmä.