The Tas-Kystabyt (Russian: Тас-Кыстабыт, Yakut: Таас Кыстаабыт, romanized: Tâs Kıstâbıt) 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.

[2] The Tas-Kystabyt rises in the southeasternmost sector of the Chersky Range System.

The highest mountain of the range is an unnamed 2,341 metres (7,680 ft) high summit.

To the east it is bound by the Upper Kolyma Highlands and to the south it overlaps with the Suntar Khayata Range.