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. There is a bridge of the
Aykhal—
Chernyshevsky highway over the Olguydakh.
Tributaries The main tributary of the Olguydakh is the long
Aallaakh (Ааллаах) from the left. The river freezes in mid October and stays under ice until mid May. The alleged radioactive-like sickness hunters who spent the night in these cauldrom led to the area being deemed cursed by the local
Yakut and given the name of Yelyuyu Chörköçüökh (
Yakut:
). A number of expeditions to Olguydakh and surrounding regions which report these stories have been made, such as those from
Richard Maack and
Ivan Mackerle. ==See also==