Also named as Namjiagbarwa Grand Cannon, located between Pomi and Bayi. The canyon is claimed by Chinese Scientists the Deepest gorge in the world. Covered by dense primitive forests, the gorge cuts through some soaring peaks up to 7000 meters. The two highest among them are the famous Mt. Namjagbarwa (Namtche Barwa, 7782m) and Mt. Gyalha Bairi (7234m).

The trail to Metok / (Motuo) is adored by Chinese keen hikers as the most challenging trail. Metok village can be accessed only by foot.

West Trailhead: Pai village near Bayi, a 6-day hike to reach Motuo.
East Trailhead: the 80km point. The road comes from Bomi ends here. A 3-day hike to reach Motuo.
Northwest Trailhead: Pailong near Tongmai on the 317 highway between Bomi and Bayi is the departure spot. Hike around 11 days to reach Motuo.