The Fossa Regia, also called the Fosse Scipio, was the first part of the Limes Africanus to be built in Roman Africa. It was used to divide the Berber kingdom of Numidia from the territory of Carthage that was conquered by the Romans in the second century BC.
It was an irregular ditch "from Thabraca on the northern coast to Thaenae on the south-eastern coast".
Africa was a Roman province on the northern coast of the continent of Africa. It was established in 146 BC, following the Roman Republic's conquest of Carthage in the Third Punic War. It roughly comprised the territory of present-day Tunisia, the northeast of Algeria, and the coast of western Libya along the Gulf of Sidra. The territory was originally and still is inhabited by Berbers, known in Latin as the Numidae and Maurii, indigenous to all of North Africa west of Egypt. In the 9th century BC, Semitic-speaking Phoenicians from the Levant built coastal settlements across the Mediterranean to support and expand their shipping networks. In the 8th century BC, the settlement of Carthage became the predominant Phoenician colony. Rome began expanding into Africa after annexing Carthage in 146 BC at the end of the Punic Wars, and into Numidia from 25 BC, establishing Roman colonies in the region.
Africa was one of the wealthiest provinces in the Roman Empire, second only to Italy. It was said that Africa fed the Roman populace for eight months of the year, while Egypt provided the remaining four months' supply. The area east of the Fossa Regia was fully Romanized with one third of the population made of Italian colonists and their descendants, the other two thirds were Romanized Berbers, who were all Christians and nearly all Latin speaking.