[4] On 5 July 1965 an Aeroflot Antonov An-2R struck a mountain of the Udokan Range on a flight between Ust-Nyukzha and Chara.

The aircraft encountered poor weather with low clouds and rain while flying along the Khani river valley.

[5] The Udokan Range rises in the central area of the Stanovoy Highlands, to the south of the upper course of the Chara, a left tributary of the Olyokma.

It stretches from SW to NE for roughly 255 km (158 mi) from the middle northern slopes of the Kalar Range to the river valley of the Olyokma, a right tributary of the Lena.

[1] The lower slopes of the range are mainly covered by larch taiga, with pre-alpine woodland, mountain tundra and bare rocky summits (golets) at higher elevations.