Vytegorsky District
The Kema belongs to the river basins of the Sheksna, the Volga, and the basin of the Caspian Sea. The river basin of the Kema comprises the eastern part of Vytegorsky District, the northern and the eastern parts of Vashkinsky District, and minor areas in Kargopolsky District of Arkhangelsk Oblast. The biggest river belonging to the basin of the Kema is the Soyda River, a tributary of Lake Kemskoye.