This aerial photo taken on Oct. 18, 2022 shows a wetland in Ruoergai County of Aba Tibetan and Qiang Autonomous Prefecture, southwest China's Sichuan Province.

This aerial photo taken on Oct. 20, 2022 shows a wetland in Hongyuan County of Aba Tibetan and Qiang Autonomous Prefecture, southwest China's Sichuan Province.

This aerial photo taken on Oct. 17, 2022 shows a wetland in Ruoergai County of Aba Tibetan and Qiang Autonomous Prefecture, southwest China's Sichuan Province.

Aba is a major water conservation area for the upper reaches of Yellow River. The prefecture has seen a significant improvement of the ecological environment in the wetlands as series of wetland conservation projects have been implemented in the region. (Xinhua/Wang Xi)