Dong Ha is 80 km east of Lao Bao on Highway 9, the border crossing with Ban Savanh in Laos.
The DMZ was a bitterly contested strip of land extending along the Ben Hai River from the Lao border to the South China Sea.
When the North Vietnamese attacked across the DMZ before capturing the rest of the province.
Today the tunnels remain much the same as they were in the sixties.
There is little left today of the old base, except for the airfield, whose outlines remain distinct.
Once part of an elaborate electronic system intended to prevent infiltration across the DMZ.
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