Vytegorsky District
The source of the Andoma is in the system of lakes in the northern part of Vytegorsky District. The river flows in the general direction south, turns west, and eventually northwest. The lower course of the Andoma is populated. In the village of Sorokopolye the Andoma accepts the Samina from the right, and downstream from this place it forms a delta as it flows into Lake Onega.