Kainuu is a region of Finland. It borders the regions of Northern Ostrobothnia, North Karelia and Northern Savonia. In the east it also borders Russia. Kainuu is known in the ancient Norse sagas as Kvenland.
The administrative capital is Kajaani. Kainuu has around 85,000 inhabitants (2006) and the population is in decline. The nature of Kainuu features forested hills, lakes and vast expanses of uninhabited woods at its most typical — 95% of the land area is forest. The climate is continental.