Kuoyka
The Kuoyka or Kuoika is a river in Yakutia, Russian Federation. It is a tributary of the Olenyok with a length of and a drainage basin area of. The Kuoyka flows north of the Arctic Circle across a lonely, desolate area of the Olenyoksky District devoid of settlements.
The name of the river comes from the Nganasan word "kuoika",, meaning a household deity.
Course
The Kuoika is a left tributary of the Olenyok. Its sources are at the limit of the Northern Siberian Lowland, off the northeastern end of the Central Siberian Plateau. It flows roughly eastwards to the southwest and south of the Beyenchime in an area with numerous lakes. In its last stretch the Kuoika turns in a SSE direction entering the Central Siberian Plateau area. It meanders strongly in its southernmost section within a wide gorge until it meets the left bank of the Olenyok from its mouth.The river is frozen between early October and early June. Its main tributary is the long Sektelyakh from the right. Other tributaries are much shorter, such as the long Kuchchugui-Kuoyka, the long Kusagan-Khayalakh and the long Oyur from the left.