The Ulakhan-Sis was first mapped in the summer of 1870 by geographer and ethnologist Baron Gerhard von Maydell (1835–1894) during his pioneering research of East Siberia.[5]
Kular is an abandoned settlement that was located in the range area.
The main ridge stretches in a roughly east/west direction from the western end of the smaller Suor Uyata (Суор-Уята) to the east and the headwaters of the Sundrun River to the Indigirka for about 160 kilometers (99 mi).[6] The highest peak is 754 metres (2,474 ft) high Vilka. To the north rises the Kondakov Plateau, a lower and wider extension of the range. In the west, the Polousny Range, a prolongation of the range on the other side of the Indigirka River, stretches further westwards. To the south, at a certain distance, rises the Alazeya Plateau.[1] Rivers Bolshaya Ercha, a tributary of the Indigirka, and Arga-Yuryakh, of the Alazeya basin, have their sources in the range.[7]
The range has mountains of middle height and smooth slopes with larch forests at the bottom of the valleys.[8]
