View of Khao Yai National Park in Thailand-Xinhua

Tourists are seen in the Khao Yai National Park, Thailand, Dec. 11, 2023. The annual International Mountain Day is marked on Dec. 11. (Xinhua/Rachen Sageamsak)

This photo taken on Dec. 11, 2023 shows forests in Khao Yai National Park, Thailand. The annual International Mountain Day is marked on Dec. 11. (Xinhua/Rachen Sageamsak)

This photo taken on Dec. 11, 2023 shows forests in Khao Yai National Park, Thailand. The annual International Mountain Day is marked on Dec. 11. (Xinhua/Rachen Sageamsak)

This photo taken on Dec. 11, 2023 shows a view of the Khao Yai National Park, Thailand. The annual International Mountain Day is marked on Dec. 11. (Xinhua/Rachen Sageamsak)

This photo taken on Dec. 11, 2023 shows a view of the Khao Yai National Park, Thailand. The annual International Mountain Day is marked on Dec. 11. (Xinhua/Rachen Sageamsak)

This photo taken on Dec. 11, 2023 shows a waterfall in Khao Yai National Park, Thailand. The annual International Mountain Day is marked on Dec. 11. (Xinhua/Rachen Sageamsak)