Ngang Pass is located on the Hoanh Son Range (a branch of Truong Son extending to the East Sea), about 6–7 km long and nearly 250 m above sea level. This used to be an important natural boundary immortalized in the poem "Passing Ngang Pass" by Ba Huyen Thanh Quan. At the top of the pass is Hoanh Son Quan (also known as Heaven's Gate), a fortress gate built in 1833 under the reign of King Minh Mang. From here, you can enjoy a panoramic view of mountains meeting the sea, especially beautiful in the early morning or late afternoon. The road up the pass is winding but upgraded, convenient for both motorbikes and cars. You should spend 45–90 minutes walking, taking photos, and enjoying the fresh air.
Ngang Pass is not only a scenic spot but also an important historical witness. It was once a natural boundary between Dai Viet and Champa, and later became the dividing line between Dang Trong (Inner Realm) and Dang Ngoai (Outer Realm). During the resistance war against the US, Ngang Pass was a strategic position witnessing the heroic struggle of our army. Hoanh Son Quan was built to control the passage over the pass, an ancient architectural work bearing the deep mark of time. Stop at the viewing points on the pass to admire the panoramic view of rolling mountains and the vast sea. In particular, the sunrise and sunset scenes on the pass possess a mystical beauty.
