The Northwest is known as a road full of emotions, with the characteristics of rugged mountains, the pass roads are the highlight for the majesty of the Northwest mountains. One of the most dangerous passes in the Northwest mountains and forests, it is impossible not to mention the O Quy Ho pass.

O Quy Ho Pass is a pass stretching on National Highway 4D, of which 2/3 of the distance is in Tam Duong district, Lai Chau province; The remaining 1/3 is located in Sa Pa, Lao Cai. This is a pass that holds the record for length in the Northwest mountains of Vietnam, with a length of up to nearly 50 km, longer than Pha Din Pass (32 km, located on the border of Son La and Dien Bien provinces) or the pass. Khau Pha (40 km, Yen Bai province). The height, ruggedness and length of O Quy Ho make the pass known as the "King of the Northwest Pass".

Located at an altitude of more than 2000m in the midst of immense mountains and clouds, the pass appears soft, stretching like a silk strip bending close to the steep cliffs. O Quy Ho Pass is also known as Hoang Lien Pass, Hoang Lien Son Pass because the pass crosses the Hoang Lien Son mountain range, or May Pass because the top of the pass is covered with clouds all year round, but few people know the origin of the name "O Quy Ho pass". Quy Ho". O Quy Ho is the cry of a bird every time the sunset falls on the top of the mountain, and behind that cry is an unsuccessful love story of a couple.

In addition to the road fascinated by the continuous bends of the sleeve, O Quy Ho is also attractive in the huge difference in temperature on the two sides of the pass. If visitors are suffering from the warm, dry heat of the western slopes of Hoang Lien mountain range (in Lai Chau province), they will be pleasantly surprised when crossing the top of the Heaven Gate pass of O Quy Ho to receive the always humid and warm breeze. cool side of Sapa (Lao Cai).

Standing on the top of the majestic pass, the natural scenery of the great thousand is captured in the sight of visitors, the fresh climate gives us a very pleasant feeling. Coming to O Quy Ho in winter, if we are lucky, we can admire a rare sight in Vietnam that is snowflakes and ice phenomenon. Drops of water on the branches, frozen flowers create a beautiful and unique image. In the higher places, we can see the white ground of snowflakes and see the images of children, couples enjoying playing together and forgetting about the harsh cold of the city. weather.