The road from Bomi crosses the Galongla Tunnel at about 3,700 metres, then drops south toward Beibeng Township, below 1,000 metres. A 2023 route feature from the Nyingchi tourism bureau says the descent can be made in a few hours and describes it as a passage through Motuo’s nine vertical natural belts. The scale is easy to picture: a high tunnel above the clouds, then a long descent beside the Yarlung Tsangpo toward a warm river valley.
The municipal geography profile helps explain why the route changes so sharply. It records a regional relief of 7,627 metres between Nyingchi’s highest and lowest points, and describes river valleys cut between high ranges. On the Zhamo Highway, that vertical geography becomes a journey measured not only in metres, but in the changing plants and village landscapes beside the road.
