Tas-Kystabyt
The Tas-Kystabyt (, ) is a mountain range in the Sakha Republic and Magadan Oblast, Far Eastern Federal District, Russia. It is also known as "хребе́т Са́рычева" —Sarychev Range, in honor of 19th century Russian cartographer Admiral Gavril Sarychev. Geography. The Tas-Kystabyt rises in the southeasternmost sector of the Chersky Range System. The range is bound by the upper Indigirka River valley and its tributary, the Nera River. The highest mountain of the range is an unnamed high summit. The range stretches in a roughly NNW/SSE direction for about . It separates the Oymyakon Plateau to the west  from the Nera Plateau to the northeast. To the east it is bound by the Upper Kolyma Highlands and to the south it overlaps with the Suntar Khayata Range. Flora. The lower slopes of the range are covered by sparse larch taiga. The higher elevations have only mountain tundra.