Known as the or "Cloud Pass" , O Quy Ho is the longest pass in Vietnam, stretching approximately 50 km along National Highway 4D. O Quy Ho Pass - Vietnam Holidays
The "Four Great Passes" (Tứ Đại Đỉnh Đèo) represent the four highest, longest, and most spectacular mountain passes in Northern Vietnam. These legendary routes, primarily located in the Northwest, are celebrated for their challenging terrain and breathtaking natural beauty. 1. O Quy Ho Pass (Lào Cai – Lai Châu) Known as the or "Cloud Pass" , O