Leatherneck Square was an area just south of the Vietnamese DMZ.
It was cornered by Con Thien to Gio Linh in the north, about 6 miles (9.7 km) wide (east to west) and from Dong Ha to Cam Lo in the south. The length of this square was about 9 miles (north to south).
Some of the heaviest fighting of the Vietnam War was fought in this 54+ square mile area.