Olguydakh

The Olguydakh, is a river in Yakutia, Russia. It is a left hand tributary of the Akhtaranda, part of the Vilyuy basin. The river is long and has a drainage basin of.
The river flows across an uninhabited sector of Mirninsky District. An area where mysterious events reportedly took place lies near the abandoned Olguydakh village on the banks of the lower course of the river.

Course

The Olguydakh belongs to the upper stretch of the Vilyuy basin. It originates in the northeastern end of lake Toymoku of the Vilyuy Plateau. The river heads first northwards for a short stretch, then it bends and heads roughly southeastwards and southwards, meandering slightly for the remainder of its course. There are many small lakes in its basin. In its last stretch the Olguydakh turns to the southwest. Its mouth is at the confluence with the long Alymdya from the right to form the Akhtaranda, from its mouth in the Vilyuy Reservoir. There is a bridge of the Aykhal—Chernyshevsky highway over the Olguydakh.

The main tributary of the Olguydakh is the long Aallaakh from the left. The river freezes in mid October and stays under ice until mid May.