View of Caka Salt Lake in Qinghai, NW China

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Photo taken on Sept. 4, 2020 shows a sightseeing vehicle running by the Caka Salt Lake in Wulan County, northwest China's Qinghai Province. (Xinhua/Zhang Long)

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Tourists visit the Caka Salt Lake in Wulan County, northwest China's Qinghai Province, Sept. 4, 2020. (Xinhua/Zhang Long)

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Tourists visit the Caka Salt Lake in Wulan County, northwest China's Qinghai Province, Sept. 4, 2020. (Xinhua/Zhang Long)

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Aerial photo taken on Sept. 4, 2020 shows a sightseeing vehicle running by the Caka Salt Lake in Wulan County, northwest China's Qinghai Province. (Xinhua/Zhang Long)

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Aerial photo taken on Sept. 4, 2020 shows a sightseeing vehicle running by the Caka Salt Lake in Wulan County, northwest China's Qinghai Province. (Xinhua/Zhang Long)

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A tourist is seen at the Caka Salt Lake in Wulan County, northwest China's Qinghai Province, Sept. 4, 2020. (Xinhua/Zhang Long)

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A tourist is seen at the Caka Salt Lake in Wulan County, northwest China's Qinghai Province, Sept. 4, 2020. (Xinhua/Zhang Long)

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Aerial photo taken on Sept. 4, 2020 shows the view of the Caka Salt Lake in Wulan County, northwest China's Qinghai Province. (Xinhua/Zhang Long)

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Aerial photo taken on Sept. 4, 2020 shows a sightseeing vehicle running by the Caka Salt Lake in Wulan County, northwest China's Qinghai Province. (Xinhua/Zhang Long)