Mount Xiao or Mount Yao is a range of mountains in western Henan, China north of the Luo River and south of Sanmenxia. Major peaks include Qīnggǎngfēng (青崗峰; 1903 m) and Guānyúnshān (冠雲山; 1666 m).
The range is part of the Xiáo (Chinese: 崤) historical region on the border of Hénán and Shānxī provinces in China. The area between Yáo and the strategic Hángǔ Pass was called Xiáohán (Chinese: 崤函).
There is a dispute over the pronunciation of its name. According to one of the most authoritative Mandarin Chinese dictionaries, the Cihai (Chinese: 辭海), xiáo should be yáo according to ancient pronunciation. However, other dictionaries such as Ciyuan (Chinese: 辭源), Xīnhuá Zìdiǎn, Hànyǔ Dà Cídiǎn, and Xiàndài Hànyǔ Cídiǎn use the pronunciation of xiáo.[1]