The river rises in the western portion of Arunachal Pradesh, India, and flows southwest first into the Bhutanese district (or dzongkhag) of Trashiyangtse and then into Tashigang.
The civic administration of Khamdang Gewog is the responsibility of the Khamdang Gup; who is directly accountable to the Dzongkhag Administration in Trashiyangtse.