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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.
North Vietnamese attacks at Lộc Ninh (in Bình Long Province), Song Be (in Phước Long Province), and at Con Thien and Khe Sanh, (in Quảng Trị Province), were other actions which, combined with Đắk Tô, became known as "the border battles."
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.
In 1831, the Nguyễn Dynasty established Quảng Trị Province, and made Vinh Linh tha administrative headquarters.
Before it became its own district, the island was in the commune of Vĩnh Quang, in Vĩnh Linh District of Quảng Trị Province.
It is an example of Vauban architecture and it later became the administrative head office of the Nguyễn Dynasty in Quảng Trị Province (1809 -1945).