The Ust-Vilyuy Range is a subrange of the
Verkhoyansk Range, part of the
East Siberian System of mountains. It rises in the southwestern side of the Verkhoyansk Range, above the eastern bank of the
Lena River, opposite the mouth of the
Vilyuy River in the Lena's western bank, at the edge of the
Central Yakutian Lowland. The highest point of the range is an unnamed peak reaching . According to other sources it is high. The range runs parallel to the
Kuturgin Range, a higher mountain chain that rises to the northeast, beyond which stretches the
Bygyn Range. The northwestern end of the
Chochum Range, which extends further southeastwards, rises off the eastern end of the Ust-Vilyuy Range. River
Lyapiske, a tributary of the Lena, flows into its right bank at the northwestern limit of the range. ==Flora and fauna==