The ''Belgae'' were the inhabitants of the northernmost part of Gaul, which was much bigger than modern Belgium. Caesar used the Latin word "''Belgium''", to refer to their country within northern Gaul, which was a region now in northern France. Modern Belgium corresponds to the lands of the Morini, Menapii, Nervii, Germani Cisrhenani, Aduatuci, and, around Arlon, a part of the country of the Treveri. All of these except the Treveri formed a less Celtic-influenced "transition zone", north of the area Caesar treated as "Belgium".