What river marked much of the border between North and South Vietnam near the DMZ?

The Bến Hải River marked much of the border between North and South Vietnam near the DMZ.

After the 1954 Geneva Accords, the Bến Hải River became a major landmark along the temporary division between the Democratic Republic of Vietnam in the north and the State of Vietnam in the south. The demilitarized zone extended roughly five kilometers on either side of the river, near the 17th parallel, in Quảng Trị Province.

The Hiền Lương Bridge crossed the river and became one of the most recognizable symbols of Vietnam’s partition. After division, the bridge was painted in contrasting colors, with the northern section red and the southern section yellow. It was later damaged and destroyed during intense fighting, including an American bombing in April 1972.

The border was never intended to be a permanent international frontier. The Geneva settlement envisioned elections and eventual reunification, but those elections did not occur. Fighting continued until 1975, and Vietnam was formally reunified in 1976. The Perfume River is associated with Huế, while the Red and Mekong rivers are much larger regional waterways.