Ustya River
Upper reaches of the Ustja
Position of Ustja in the catchment area of the Northern Dvina
The Ustja (Russian Устья ) is a right tributary of the Waga in the Arkhangelsk Oblast in northwestern Russia.
The 477 km long river has its source northwest of Veliky Ustjug. It flows predominantly in a westerly direction to the Waga. The catchment area covers 17,500 km ². 107 km above the mouth of the average discharge 92.4 m³ / s Most important tributaries are Kisma and Kokschenga, both from the left.