Плесецкий район
The source of the Mekhrenga is in the south of the Plesetsky District, close to the border with the Nyandomsly District, several kilometers to the west of the village of Saltozero. It flows east, passes two lakes (Lake Ora and Lake Chyolmus) and then turns north. Downstream from the lakes, the valley of the Mekhrenga is populated, except for the stretch of the river within the town limits of Mirny. The mouth of the Mekhrenga is located in the village of Ust-Mekhrenga.