The people of Belgium are primarily of two ethnic groups, the Flemings (Teutonic origin) and the Walloons (Celtic origin, probably with an admixture of Alpine elements). The most distinguishing characteristic of these two groups is language. The Flemings speak Dutch (often referred to by its historic regional name, Flemish; see Flemish Language), and the Walloons speak French. The predominantly Flemish provinces are in the northern half of Belgium, called Flanders (Flemish Region), and the predominantly Walloon provinces are in the southern half, called Wallonia. The capital of Brussels, an enclave within the Flanders region, is mixed. In 1993 these three ethnolinguistic areas became official federal regions.