Siniolchu is one of the tallest mountains of the Indianstate of Sikkim. The 6,888 metres (22,598 ft) mountain is considered to be particularly aesthetically attractive, having been described by Douglas Freshfield as "the most superb triumph of mountain architecture and the most beautiful snow mountain in the world". It is situated near the green lake adjacent to Kangchenjunga, the highest peak in the state and third highest in the world.
Siniolchu’s summit was first scaled in 1936 by the German climbers Karl Wien and Adi Göttner. Later Sikkimese Everest climber, Sonam Gyatso, also scaled the top.