Sumatra is the fifth largest island in the world and the third largest in Indonesia. Population is about 40 million. The island is divided in the Aceh, Riau, Jambi, Bengkulu and Lampung provinces, and North, South and West Sumatra. It borders the Indian Ocean to the west and Malaysia to the east, separated from the Malay peninsula by the Malacca strait. Area is about 425.000 square kilometers.