A tourist walks in a cole field beside the Qinghai Lake in northwest China's Qinghai Province, on July 21, 2009. As the boom season for tourism began, more and more tourists arrived here to enjoy the natural scenery. [Xinhua]

Tourists walk beside the Qinghai Lake in northwest China's Qinghai Province, on July 21, 2009. As the boom season for tourism began, more and more tourists arrived here to enjoy the natural scenery. [Xinhua]