The Ulakhan-Sis Range (Russian: Улахан-Сис ; Yakut : Улахан Сис ) is a mountain range in the Sakha Republic , Far Eastern Federal District , Russia.
6-414: This range is one of the areas of Yakutia where baydzharakhs are found. Kigilyakh rock formations are also found on this range. 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. Kular is an abandoned settlement that was located in the range area. The Ulakhan-Sis Range rises in
12-586: A certain distance, rises the Alazeya Plateau . Rivers Bolshaya Ercha , a tributary of the Indigirka, and Arga-Yuryakh , of the Alazeya basin, have their sources in the range. The range has mountains of middle height and smooth slopes with larch forests at the bottom of the valleys. Baydzharakh Baydzharakh ( Russian : Байджарах ; Yakut : Бадьараах, Baçaraakh ) is a term based in
18-499: The Yakut language , referring to a roughly cone-shaped natural rock formation . They are usually composed of siltstone , silty peat or loam . Baydzharakhs form owing to thermokarst activity in periglacial areas. They are the result of a cryolithological process by which polygonal ice-wedges thaw within the permafrost . These formations usually reach a height between 5 meters (16 ft) and 10 meters (33 ft) with an area at
24-640: The base between 15 square meters (160 sq ft) to 20 square meters (220 sq ft). In the first phase of the ice melting process baydzharakhs have a pillar-like shape. When the ice mass in the surrounding rocks is high, they swell and form rounded depressions known as alas (Алаас) in Yakut. These depressions are usually between 8 meters (26 ft) to 12 meters (39 ft) in depth, but exceptionally may be 30 meters (98 ft) deep. Baydzharakhs come often combined with alas depressions. Baydzharakh formations are found in different places across
30-717: The east and the headwaters of the Sundrun River to the Indigirka for about 160 kilometers (99 mi). 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
36-657: The southeastern limits of the Yana-Indigirka Lowland , northwest and west of the Kolyma Lowland and northeast of the Aby Lowland , along the interfluve of the Erna and Shandrin rivers in the northwest, Shangina in the south, and Khatysty and Arga-Yuryakh in the southeast. The main ridge stretches in a roughly east/west direction from the western end of the smaller Suor Uyata (Суор-Уята) to
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