What is the name of the longest glacier in the Tien Shan mountain range?

The longest glacier in the Tien Shan mountain range is the Inylchek Glacier, also spelled Engilchek or Enilchek. Its South Inylchek branch gives the system an overall length of roughly 60.5 to 61 kilometres.

The glacier lies in the Central Tien Shan, near the borders of Kyrgyzstan, China and Kazakhstan. It originates around the massive Khan Tengri and Jengish Chokusu—also known as Victory Peak—massif. The main glacier has two major arms: the longer South Inylchek and the shorter North Inylchek.

Meltwater flows into the Engilchek River and eventually toward the Tarim Basin. The glacier also helps form Lake Merzbacher, a seasonally unstable glacial lake famous for glacial lake outburst floods. These sudden releases can send large volumes of water down the valley.

The name appears in several transliteration systems, which explains why “Inylchek,” “Engilchek” and “Enilchek” all occur in maps and scientific writing. Baltoro and Siachen are in the Karakoram, while Fedchenko Glacier is in the Pamirs, so none is the Tien Shan answer.