East of Nepal the boundary follows the watershed between the Tista river system, and the Yaru Chu and the sources of the Amo Chu in Tibet, and crosses the Natu and Jelep Passes. Thereafter it crosses the Arno Chu, and, following the watershed between the Arno Chu and Paro Chu, joins the Great Himalayan Range at Chomo Lhari and runs east along the crest of that range upto the Mela pass (Long. 91° 40′ E and Lat. 27° 57′ N).
There it turns south and about 13 miles from the Mela Pass, turns east, crosses the Namjang river, and following the crest of the Great Himalayan Range which is also the watershed between the Chayul Chu in Tibet and the Kameng, Kamla and Khru rivers in India, proceeds east and northeast.
Thereafter it crosses the Subansiri river and then the Tsari river just south of Migyitun and taking a north-easterly direction crosses the Tunga Pass (approximately Long. 94° 10′ E and Lat. 28° 59′ N). It then runs east, crosses the Dihang and ascends the watershed between Chimdru Chu and Rongta Chu in Tibet and the Dibang and its tributaries in India.
The boundary crosses the Yonggyap Pass (Long. 95° 36′ E and Lat. 29° 13′ N) and the Kangri Karpo Pass (Long. 96° 5′ E and Lat. 29° 28′ N) in this sector. It then crosses the Lohit river a few miles south of Rima and joins the tri-junction of the India, Burma and China boundaries near the Diphu Pass.