Tourists pose for photos at the Namco Lake, the highest lake of the world at 4,718 meters above sea level, in Damxung County, southwest China's Tibet Autonomous Region, April 25, 2009. Increasing number of tourists visit the Namco Lake, one of the three holy lakes in the region, as the weather becomes warmer. (Xinhua/Zhang Quan)

Tourists visit the Namco Lake, the highest lake of the world at 4,718 meters above sea level, in Damxung County, southwest China's Tibet Autonomous Region, April 25, 2009. (Xinhua/Zhang Quan)

A girl riding a yak poses for a photo beside the frozen Namco Lake, the highest lake of the world at 4,718 meters above sea level, in Damxung County, southwest China's Tibet Autonomous Region, April 25, 2009. (Xinhua/Zhang Quan)

Photo taken on April 25, 2009 shows the melting Namco Lake, the highest lake of the world at 4,718 meters above sea level, in Damxung County, southwest China's Tibet Autonomous Region. (Xinhua/Zhang Quan)

Tourists visited the Namco Lake, the highest lake of the world at 4,718 meters above sea level, in Damxung County, southwest China's Tibet Autonomous Region, April 25, 2009.KKKwww.Chinakindnesstour.com

Increasing number of tourists visit the Namco Lake, one of the three holy lakes in the region, as the weather becomes warmer.KKKwww.Chinakindnesstour.com