The Malagasy ethnic group forms over 90 percent of Madagascar's population and is typically divided into eighteen ethnic subgroups. Recent DNA research revealed that the genetic makeup of the average Malagasy person constitutes an approximately equal blend of Southeast Asian and East African genes, although the genetics of some communities show a predominance of Southeast Asian or East African origins or some Arab, Indian or European ancestry.
Southeast Asian features – specifically from the southern part of Borneo – are most predominant among the Merina of the central highlands, who form the largest Malagasy ethnic subgroup at approximately 26 percent of the population, while certain communities among the coastal peoples (collectively called côtiers) have relatively stronger East African features. The largest coastal ethnic subgroups are the Betsimisaraka (14.9 percent) and the Tsimihety and Sakalava (6 percent each).