[1] In the tongue of Thái people (an ethnic minority in Vietnam), "Khau Phạ" means "sky-high horn" (Vietnamese: "sừng trời")[2] since the top of the pass - engulfed in dense fog - looks like rising from a sea of clouds.

Khau Phạ Pass, which lies between Văn Chấn District and Mù Căng Chải District, is the most rugged and longest pass on National Highway 32 with a length of 30 kilometres (19 mi).

Starting from Yên Bái City, visitors need to go upward for about five hours before reaching the pass surrounding by endlessly extending mountains.

[3] Along Khau Phạ are terraced rice paddies cultivated by H'Mông and Thái ethnic minorities and pristine forests which are home to some rare species such as Parashorea chinensis.

[2] Located at an altitude of over 1,200 meters above sea level, Khau Phạ has a temperate weather year-round like Da Lat's one, but the temperature is much lower due to its position in the subtropical region.