Vietnamese Demilitarized Zone, between North and South Vietnam (1954–76) at approximately the 17th parallel north
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The 17th parallel used as the border between North Vietnam and South Vietnam from 1954 to 1975 was located just to the south, at the Bến Hải River in Quảng Trị Province.
The demarcation line did not exactly coincide with the 17th parallel but ran south of it, approximately along the Ben Hai River in Quang Tri Province to the village of Bo Ho Su and from there due west to the Laos-Vietnam border.