Photo taken on June 15, 2019 shows the Sayram Lake in Northwest China's Xinjiang Uygur Autonomous Region. Surrounded by grasslands and the Tianshan Mountains, the beautiful lake covers an area of 450 square kilometers, making it the highest and biggest mountain lake in the autonomous region. (Photo: China News Service)

Photo taken on June 15, 2019 shows the Sayram Lake in Northwest China's Xinjiang Uygur Autonomous Region. Surrounded by grasslands and the Tianshan Mountains, the beautiful lake covers an area of 450 square kilometers, making it the highest and biggest mountain lake in the autonomous region. (Photo: China News Service)

Photo taken on June 15, 2019 shows the Sayram Lake in Northwest China's Xinjiang Uygur Autonomous Region. Surrounded by grasslands and the Tianshan Mountains, the beautiful lake covers an area of 450 square kilometers, making it the highest and biggest mountain lake in the autonomous region. (Photo: China News Service)

Photo taken on June 15, 2019 shows the Sayram Lake in Northwest China's Xinjiang Uygur Autonomous Region. Surrounded by grasslands and the Tianshan Mountains, the beautiful lake covers an area of 450 square kilometers, making it the highest and biggest mountain lake in the autonomous region. (Photo: China News Service)

Photo taken on June 15, 2019 shows the Sayram Lake in Northwest China's Xinjiang Uygur Autonomous Region. Surrounded by grasslands and the Tianshan Mountains, the beautiful lake covers an area of 450 square kilometers, making it the highest and biggest mountain lake in the autonomous region. (Photo: China News Service)