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Distribution of major Malagasy tribes. The Malagasy (French: Malgache or Malagasy: Gasy) are the Austronesian-speaking ethnic groups indigenous to the island country of Madagascar. They emerged over several centuries through interaction between Austronesians from Maritime Southeast Asia, who settled mainly in the island's interior, and Bantu migrants from Southeast Africa who arrived later and established communities along the coasts. Traditionally, the Malagasy have been divided into various sub-ethnic groups. The "Highlanders," such as the Merina and Betsileo of the central highlands around Antananarivo, Alaotra (Ambatondrazaka) and Fianarantsoa, tend to have more Austronesian ancestry. In contrast, the "coastal dwellers," including the Sakalava, Bara, Vezo, Betsimisaraka, and Mahafaly, generally have a higher proportion of Bantu ancestry.
The Merina are broadly divided into two subgroups that differ in their ancestral composition. The first, often referred to as the "Merina A," includes the Hova and Andriana classes, who possess approximately 77 percent Asian ancestry (mainly from Borneo and other Austronesian peoples, with around 7 percent Han-related), 20 percent African ancestry (largely Bantu and Yoruba-related), and about 3 percent from other origins. The second subgroup, known as the "Merina B" or Andevo, have roughly 50 percent African ancestry, 46 percent Asian (primarily Austronesian with minor Han-related ancestry), and 4 percent from other sources. The Malagasy population was 2,242,000 in the first census in 1900. Their population had a massive growth in the next hundred years, especially under the French colonial period as French Madagascar.