Ukukit
The Ukukit () is a river in Yakutia (Sakha Republic) and Krasnoyarsk Krai, Russia. It is a tributary of the Olenyok with a length of . Its drainage basin area is . The river flows north of the Arctic Circle across a lonely, desolate area of the Olenyoksky District devoid of settlements. In the 1980s kimberlite dikes were discovered by geologists in the basin of the Ukukit. Course. The Ukukit is a left tributary of the Olenyok. Its sources are in the northeastern corner of the Central Siberian Plateau. It heads first eastwards and, about halfway down its course, it bends and  flows roughly northeastwards. Finally the river joins the left bank of the Olenyok upstream from the confluence of the Birekte, upstream of its mouth. The Ukukit is fed by rain and snow. It is frozen between early October and late May or early June. Its longest tributary is the long Kutuguna from the left.