Photo shows thousands of hikers participant in a hiking event at the Kanbula national park in Huangnan Tibetan Autonomous Prefecture, northwest China's Qinghai Province, on May 19 to mark the National Tourism Day of China. 

Photo shows thousands of hikers participant in a hiking event at the Kanbula national park in Huangnan Tibetan Autonomous Prefecture, northwest China's Qinghai Province, on May 19 to mark the National Tourism Day of China. 

Photo shows thousands of hikers participant in a hiking event at the Kanbula national park in Huangnan Tibetan Autonomous Prefecture, northwest China's Qinghai Province, on May 19 to mark the National Tourism Day of China. 

Photo shows thousands of hikers participant in a hiking event at the Kanbula national park in Huangnan Tibetan Autonomous Prefecture, northwest China's Qinghai Province, on May 19 to mark the National Tourism Day of China. 

Photo shows thousands of hikers participant in a hiking event at the Kanbula national park in Huangnan Tibetan Autonomous Prefecture, northwest China's Qinghai Province, on May 19 to mark the National Tourism Day of China. 

Photo shows thousands of hikers participant in a hiking event at the Kanbula national park in Huangnan Tibetan Autonomous Prefecture, northwest China's Qinghai Province, on May 19 to mark the National Tourism Day of China.