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Phonological zones in Africa Some 30 percent of the world's languages are spoken in Africa, by one current estimate (Gordon 2005). Given this linguistic richness, it is not surprising that African languages reveal robust patterns of phonology and phonetics that are much less frequent, or which barely occur, in other regions of the world. These differences are instructive for many reasons, not the least of which is the fact that they bring to light potentials for sound structure which, due to accidents of history and geography, have been more fully developed in Africa than in other continents. Just as importantly, a closer study of “variation space” across African languages shows that it is not homogeneous, as some combinations of properties tend to cluster together in genetically unrelated languages while other imaginable combinations are rare or unattested, even in single groups; crosslinguistic variation of this sort is of central interest to the study of linguistic universals and typology. A further important reason for studying phonological patterns in Africa is the light they shed upon earlier population movements and linguistic change through contact. In preparing this chapter, we initially set out to examine characteristics that are more typical of the African continent as a whole than of other broad regions of the world (a goal initially set out by Greenberg 1959, 1983). However, this goal quickly turned out to be unrealistic.