Ben Hai River

The Ben Hai River (Vietnamese: Sông Bến Hải) is a river in central Vietnam which became an important landmark in the partition of the country into a northern and a southern zone along the 17th parallel by the Geneva Accords of 1954. The demilitarized zone (DMZ) separating the two parts extended about 5 kilometers (3.1 mi) from either side of the river.

The Ben Hai River has a total length of about 100 kilometers; its source is located in the Annamite Mountains along the border with Laos and it flows into the South China Sea at Cua Tung (Tung River mouth). In the mountains, the river is named "Rao Thanh". It flows from west to east just south of the 17th parallel and close to the northern border of Quang Tri Province, in which it is located. At its widest point, the river is about 200 meters wide.

At the time of the partition, the principal north-south road (Highway 1) crossed the Ben Hai River over Hien Luong Bridge (also known as the "Peace Bridge"), a beam bridge built from steel by the French in 1950. After the partition, the northern portion of the bridge was painted red and the southern portion yellow. The bridge was damaged by American bombardment during the Vietnam War in 1967. After the Paris Peace Accords, a modern bridge was built next to the old bridge.

Coordinates: 17°0′12.60″N 107°3′5.4″E / 17.0035°N 107.0515°E / 17.0035; 107.0515