The river basin of the Onega is spread over the west of Arkhangelsk Oblast , north - west of Vologda Oblast .
The river basin of the Onega is also includes minor areas in the east of Republic of Karelia .
The river basin of the Onega is spread over the west of Arkhangelsk Oblast , north - west of Vologda Oblast , and also includes minor areas in the east of Republic of Karelia .