Multiple ice chunks scatter on the lake surface under the blue sky on Sayram Lake, the largest alpine lake in Bortala Mongolian Autonomous Prefecture, northwest China's Xinjiang Uyghur Autonomous Region.(Photo: China News Service)

Multiple ice chunks scatter on the lake surface under the blue sky on Sayram Lake, the largest alpine lake in Bortala Mongolian Autonomous Prefecture, northwest China's Xinjiang Uyghur Autonomous Region.(Photo: China News Service)

Multiple ice chunks scatter on the lake surface under the blue sky on Sayram Lake, the largest alpine lake in Bortala Mongolian Autonomous Prefecture, northwest China's Xinjiang Uyghur Autonomous Region.(Photo: China News Service)

Multiple ice chunks scatter on the lake surface under the blue sky on Sayram Lake, the largest alpine lake in Bortala Mongolian Autonomous Prefecture, northwest China's Xinjiang Uyghur Autonomous Region.(Photo: China News Service)