The basin also includes Lake Kubenskoye, one of the biggest lakes of Vologda Oblast. The river basin is bounded from the south by the western part of the Northern Ridge, which separates the basins of the Sukhona and the Kostroma. From the north, the Sukhona river basin is bounded in the western part by the Kharovsk Ridge hill chain which separates it from the river basin of the Vaga.