Rainbow arches over Hukou Waterfall of Yellow river

A rainbow recently appeared over the renowned Hukou Waterfall in northwest China's Shaanxi Province, attracting many tourists. 　

Located on the border of Shanxi and Shaanxi provinces, Hukou Waterfall is the second-largest in China and the largest on the Yellow River. The width of the waterfall changes with season; it is usually about 30 meters but increases to 50 meters during flood season.