Entremont is a 3.5 hectare archaeological site three kilometres from Aix-en-Provence at the extreme south of the Puyricard plateau. In antiquity, the oppidum at Entremont was the capital of the Celtic-Ligurian confederation. It was settled between 180 and 170 B.C., somewhat later than the inhabitation of other Gallic oppida, such as Saint-Blaise. The site was abandoned when it was taken by the Romans in 123 B.C. and replaced by Aquae Sextiae, a new Roman city founded at the foot of the plateau. By 90 B.C., the former oppidum was completely uninhabited.
The site contains two distinct areas of settlement surrounded by ramparts. Archaeologist Fernand Benoit named the older area, on the summit, "Ville Haute", and the lower "Ville Basse".