Longju, also known as Longzu, is a disputed territory situated in the eastern sector of the China–India border. While currently under Chinese control, the area remains claimed by India.
The village of Longju is specifically located in the Tsari Chu Valley, approximately 2.5 kilometres south of the town of Migyitun, which is regarded as the historical border of Tibet. The region south of Longju is inhabited by the Tagin tribe of Arunachal Pradesh.