Walong is an administrative town and the headquarters of eponymous circle in the Anjaw district in eastern-most part of Arunachal Pradesh state in India. It also has a small cantonment of the Indian Army. Walong is on banks of Lohit River, which enters India 35 km north of Walong at India-China LAC at Kaho pass.

Walong is also the easternmost town in mainland India. It is 20 km south of Kibithu, 60 km west of Diphu Pass (near India-China-Myanmar tri-junction), and 90 km north of district headquarter at Hawai. Anjaw district was carved out of Lohit District in 2004.