[3][4] 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.

[6] 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).

To the north rises the Kondakov Plateau, a lower and wider extension of the range.

[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.