The Ustye () is a river in Yaroslavl Oblast in Russia, a left tributary of the river Kotorosl (Volga's basin).Устье (река в Ярославской обл.), Great Soviet Encyclopedia The river is long, and the area of its drainage basin is .«Река Устье», Russian State Water Registry The Ustye freezes up in November and remains icebound until the end March to early April.
References