[4] Yadong County is coextensive with the Chumbi valley that extends south into the Himalayas between Sikkim and Bhutan.

Two rivers Khambu Machu and Tromo Chu arise within the valley and join at the town of Yatung.

[5][obsolete source] Yadong is connected to the Indian state of Sikkim via the Nathu La pass.

As part of the China Western Development strategy, the Chinese government planned to extend the Qinghai–Tibet Railway from Lhasa to Yatung.

[6] According to the Convention of Calcutta of 1890–94 signed by Great Britain and Qing dynasty China, the market at Old Yatung was opened to India in the valley coming down from the Jelep La pass.