The Vashka is a river in Udorsky District of the Komi Republic and Leshukonsky and Mezensky Districts of Arkhangelsk Oblast in Russia. It is a left and the biggest tributary of the Mezen River. It is long, and the area of its basin . The principal tributaries of the Vashka are the Mytka (left), the Loptyuga (right), the Yortom (left), the Yevva (right), the Sodzim (right), the Puchkoma (left), the Zyryanskaya Ezhuga (left), and the Chulas (right).