An aerial drone photo shows researchers working at the Zadoi section of Zhaqu River in northwest China's Qinghai Province, July 21, 2024. Since July 20, a Chinese expedition team has been conducting research on the water resources and ecological environment in the headwater regions of the Yangtze and Lancang rivers. The expedition, comprising around 20 members, carried out scientific investigations into river hydrology, water ecology, soil erosion, glaciers and permafrost in Qinghai Province. Annual scientific expeditions to the source of the Yangtze River have been conducted since 2012. (Xinhua/Wu Zhizun)

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