Tegermansu Pass or Tigarman Su Pass is a closed mountain pass on the border between Afghanistan and China in Wakhan Corridor, in the Hindu Kush — Pamir mountain range. It is located between the Tegermansu Valley on the eastern end of the Little Pamir and Chalachigu Valley in Xinjiang, China. Historically, it was one of the three routes between China and Wakhan.

Karachukar Valley or Chalachigu Valley is a valley in Taxkorgan Tajik Autonomous County, Xinjiang, China. It contains the basin of the Karachukar River, a tributary of the Tashkurgan River, and is regarded as part of Taghdumbash Pamir. The valley borders Afghanistan to the west and northwest, Tajikistan to the north, and Pakistan to the south. The name of the valley is from Kyrgyz, meaning "black cave".