Fossatum Africae
Tunisia · built 122
Fossatum Africae ("African ditch") is one or more linear defensive structures (sometimes called limes) claimed to extend over 750 km (470 mi) or more in northern Africa constructed during the Roman Empire to defend and control the southern borders of the Empire in Africa. It is considered to be part of the greater frontier system in Roman Africa. It is considered to have many similarities of construction to Hadrian's Wall, one of the northern borders of the Empire in Britain.
Archaeological site data from Wikidata (CC0). Summary from Wikipedia (CC BY-SA).