Tangmai natural barrier, known as "Michael Tong cemetery," the Sichuan-Tibet line is the most dangerous section of the road between Bomi and August, a total length of 14 kilometers, this section average about two hours to go. Here known as "the world's second largest group mudslides," "Tibet is difficult, it is difficult on the West." Sichuan-Tibet line running south, along the mountain soil is more loose, and the nearby snow-capped mountains across the river, a case of rain or snow melt, prone to mudslides and landslides, so Michael Tong, ranked Long line of "death road" he said. Tangmai located in Bomi County, Tibet Autonomous Region, is a pleasant climate where, is the canyon area, just over 1800 meters above sea level, the rich often rain washed away the rocks on both sides of the valley, 10 kilometers before the town through wheat is the Sichuan-Tibet line Palong the famous natural barrier.