Lake Kenozero is a freshwater lake, located in the south-west of Plesetsky District of Arkhangelsk Oblast in Russia. It is one of the biggest lakes in Arkhangelsk Oblast and the biggest one in Plesetsky District. The area of the lake is 68.6 square kilometres (26.5 sq mi), and the area of its basin is 5,450 square kilometres (2,100 sq mi). Lake Kenozero is the source of the Kena River, a tributary of the Onega River. The lake thus belongs to the Onega basin and the White Sea basin.