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In page Demographics of Equatorial Guinea:

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The majority of the people of Equatorial Guinea are of Niger-Congo origin. The largest ethnic group, the Fang, are indigenous to the mainland, but substantial migration to Bioko Island has resulted in Fang dominance over the earlier Bubi inhabitants. The Fang constitute 80% of the population and are themselves divided into 67 clans. Those in the northern part of Rio Muni speak Fang-Ntumu, while those in the south speak Fang-Okah; the two dialects are mutually unintelligible. The Bubi, who constitute 15% of the population, are indigenous to Bioko Island.[citation needed]