A tourist takes pictures while riding a yak held by a Tibetan man at Namtso lake in the Tibet Autonomous Region, China November 18, 2015. Located four hours' drive from Lhasa at an altitude of around 4,718m (15,479 ft) above sea level, Namtso lake is not only the highest saltwater lake in the world but also considered sacred attracting throngs of devotees and pilgrims. REUTERS/Damir Sagolj
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