The Unnukka [un uk ː ː ɑ ] is a lake in eastern Finland. It lies between Leppävirta in the north and in the south Varkaus in the countryside Savo. The Unnukka has an area of 80.45 km ². It drains the lake Haukivesi in the Saimaa lake system. To the north extended the Unnukka to the lake Kallavesi.