Khau Pha Pass or Cao Pha Pass is a masterpiece of Mu Cang Chai Yen Bai tourism in the golden season. The pass is on Highway 32 in Cao Pha commune, Mu Cang Chai district, on the border with Van Chan district, Yen Bai province. Khau Pha Pass is the most dangerous and longest pass on Highway 32 with a length of over 30 km. Khau Pha Pass passes many famous places such as La Pan Tan, Mu Cang Chai, Tu Le, Che Cu Nha, Nam Co, etc. at an altitude of 1,200m to 1,500m above sea level.