A NEW DISCOVERY THE GREAT POLUNGTSANGPO CANYON

It is found that the Polungtsangpo valley is also one of great canyons in the world. It might be at least the third greatest canyon fallowing the Yalungtsangpo Canyon and the second one, Kaligendege Canyon of Nipal. Its depths can reach up to 4 001 m, 3 397 m and 3 271 m in the down and upper streams, respectively. It is 50 km and 76 km long depending on different upper branches.