Tourists take photos of the scenery around the icy lake Nam Co located at the boundary of Damxung and Baingoin counties, southwest China's Tibet Autonomous Region, on May 12, 2013. Lake Nam Co, the highest saltwater lake of the world at 4,718 meters above the sea level, is regarded as a sacred lake in Tibetan Buddhism. (Xinhua/Chen Tianhu)

  Painter Mo Huasheng draws a painting near the icy lake Nam Co located at the boundary of Damxung and Baingoin counties, southwest China's Tibet Autonomous Region, on May 12, 2013. Lake Nam Co, the highest saltwater lake of the world at 4,718 meters above the sea level, is regarded as a sacred lake in Tibetan Buddhism. (Xinhua/Chen Tianhu)

  Tourists enjoy the scenery around the lake Nam Co located at the boundary of Damxung and Baingoin counties, southwest China's Tibet Autonomous Region, on Aug. 12, 2012. Lake Nam Co, the highest saltwater lake of the world at 4,718 meters above the sea level, is regarded as a sacred lake in Tibetan Buddhism. (Xinhua/Chen Tianhu) 

People walk along the icy lake Nam Co located at the boundary of Damxung and Baingoin counties, southwest China's Tibet Autonomous Region, on May 12, 2013. Lake Nam Co, the highest saltwater lake of the world at 4,718 meters above the sea level, is regarded as a sacred lake in Tibetan Buddhism. (Xinhua/Chen Tianhu) 

Girls of Tibetan ethnic group pose for a photo next to the icy lake Nam Co located at the boundary of Damxung and Baingoin counties, southwest China's Tibet Autonomous Region, on May 12, 2013. Lake Nam Co, the highest saltwater lake of the world at 4,718 meters above the sea level, is regarded as a sacred lake in Tibetan Buddhism. (Xinhua/Chen Tianhu) 

A cattle is pictured near the lake Nam Co located at the boundary of Damxung and Baingoin counties, southwest China's Tibet Autonomous Region, on Aug. 12, 2012. Lake Nam Co, the highest saltwater lake of the world at 4,718 meters above the sea level, is regarded as a sacred lake in Tibetan Buddhism. (Xinhua/Chen Tianhu) 

Mountains are pictured near the lake Nam Co located at the boundary of Damxung and Baingoin counties, southwest China's Tibet Autonomous Region, on May 12, 2013. Lake Nam Co, the highest saltwater lake of the world at 4,718 meters above the sea level, is regarded as a sacred lake in Tibetan Buddhism. (Xinhua/Chen Tianhu) 

Photo taken on May 12, 2013 shows the scenery of the lake Nam Co located at the boundary of Damxung and Baingoin counties, southwest China's Tibet Autonomous Region. Lake Nam Co, the highest saltwater lake of the world at 4,718 meters above the sea level, is regarded as a sacred lake in Tibetan Buddhism. (Xinhua/Chen Tianhu)