An aerial drone photo taken in Jixian County, north China's Shanxi Province, on Oct. 28, 2026, shows a rainbow over the Yellow River's Hukou Waterfall. (Photo by Lyu Guiming/Xinhua)

An aerial drone photo taken in Jixian County, north China's Shanxi Province, on Oct. 28, 2026, shows a rainbow over the Yellow River's Hukou Waterfall. (Photo by Lyu Guiming/Xinhua)

An aerial drone photo taken in Jixian County, north China's Shanxi Province, on Oct. 28, 2026, shows a rainbow over the Yellow River's Hukou Waterfall. (Photo by Lyu Guiming/Xinhua)

An aerial drone photo taken in Jixian County, north China's Shanxi Province, on Oct. 28, 2026, shows a rainbow over the Yellow River's Hukou Waterfall. (Photo by Lyu Guiming/Xinhua)

An aerial drone photo taken in Jixian County, north China's Shanxi Province, on Oct. 28, 2026, shows a rainbow over the Yellow River's Hukou Waterfall. (Photo by Lyu Guiming/Xinhua)