The Minangkabau language is a member of the Austronesian language family, and is closest to the Malay language, though when the two languages split from a common ancestor and the precise historical relationship between Malay and Minangkabau culture is not known. Until the 20th century the majority of the Sumatran population lived in the highlands. The highlands are well suited for human habitation, with plentiful fresh water, fertile soil, a cool climate, and valuable commodities. It is probable that wet rice cultivation evolved in the Minangkabau Highlands long before it appeared in other parts of Sumatra, and predates significant foreign contact.