Photo taken on Oct. 6, 2014 shows the scene of a small village in Medog County of Nyingchi Prefecture, southwest China's Tibet Autonomous Region. Located in the lower reaches of the Yarlung Zangbo river, Medog boasts of well-preserved environment and biodiversity. (Xinhua/Wen Tao)

A woman walks across a bridge made of vines above the Yarlung Zangbo river in Medog County in Nyingchi Prefecture, southwest China's Tibet Autonomous Region, Oct. 6, 2014. Located in the lower reaches of the Yarlung Zangbo river, Medog boasts of well-preserved environment and biodiversity. (Xinhua/Wen Tao)

Photo taken on Oct. 6, 2014 shows a lizard in Medog County of Nyingchi Prefecture, southwest China's Tibet Autonomous Region. Located in the lower reaches of the Yarlung Zangbo river, Medog boasts of well-preserved environment and biodiversity. (Xinhua/Wen Tao)

Photo taken on Oct. 6, 2014 shows the autumnal scenery of the Medog County in Nyingchi Prefecture, southwest China's Tibet Autonomous Region. Located in the lower reaches of the Yarlung Zangbo river, Medog boasts of well-preserved environment and biodiversity. (Xinhua/Wen Tao)

Photo taken on Oct. 6, 2014 shows a waterfall in Medog County of Nyingchi Prefecture, southwest China's Tibet Autonomous Region. Located in the lower reaches of the Yarlung Zangbo river, Medog boasts of well-preserved environment and biodiversity. (Xinhua/Wen Tao)

Photo taken on Oct. 6, 2014 shows the Great Bend of the Yarlung Zangbo River in Medog County of Nyingchi Prefecture, southwest China's Tibet Autonomous Region. Located in the lower reaches of the Yarlung Zangbo river, Medog boasts of well-preserved environment and biodiversity. (Xinhua/Wen Tao)