Hoành Sơn Quan is a historic gate located on the summit of Đèo Ngang (Ngang Pass), marking the natural border between Hà Tĩnh and Quảng Bình provinces in central Vietnam. Built in 1833 under the reign of Emperor Minh Mạng of the Nguyễn Dynasty, the gate was constructed to control movement between the northern and southern regions of the country. The gate is about 4 meters high, with walls extending 30 meters on either side, and the words "Hoành Sơn Quan" inscribed above the archway

Ha Tinh is a province on the North Central Coast of Vietnam. Together with neighbouring Nghe An province the two provinces are together called "Nghe Tinh", and the locals are known for speaking Vietnamese with a very noticeable regional accent. It had a population of 1,501,866 in 2021.