Tohmajärvi (Finnish pronunciation: [ˈtohmɑˌjærʋi]) is a municipality of Finland.

[1] The population density is 4.75 inhabitants per square kilometre (12.3/sq mi).

Sortavala, a town in the Karelia, Russia, is located 81 kilometres (50 mi) south of Tohmajärvi.

Tohmajärvi is located along the Blue Highway, which is an international tourist route from Mo i Rana, Norway to Pudozh, Russia via Sweden.

The border crossing to Russia, Niirala, is in Värtsilä, now part of Tohmajärvi.