The Quang Tri Border Guard said on October 1 that it was working with local authorities and other forces to secure the site while awaiting the removal of the bomb.
At about 8 am on September 30, Ho Van Thong, 36, from A Xoc-Cha Ly Village in Huong Lap Commune, found the bomb while working on a farm.
It was lying close to the river, about 150 metres south-east of A Xoc Suspension Bridge.
Initial information indicated that the bomb was about one metre long, but its type has yet to be identified.
After receiving the report, the Huong Lap Border Guard Station worked with local police and military personnel to cordon off the area and secure the site.
Authorities also warned residents not to approach or enter the danger zone or allow livestock to graze there.
The Huong Lap Border Guard Station has contacted the bomb clearance unit under the Quang Tri Military Command to arrange for the bomb to be safely handled in accordance with regulations.