Heinola is a town and a municipality of 17,838 inhabitants located in the eastern part of the Päijänne Tavastia region, Finland, near the border…Heinola is a town and a municipality of 17,838 inhabitants located in the eastern part of the Päijänne Tavastia region, Finland, near the borders of the South Savonia region and the Kymenlaakso region. It is the third largest municipality in the region in terms of population after Lahti and Hollola. The neighbour municipalities of Heinola are Asikkala, Hartola, Iitti, Kouvola, Mäntyharju, Nastola, Pertunmaa and Sysmä.