The many island cultures within the Polynesian Triangle share similar languages derived from a proto-Malayo-Polynesian language used in Southeast Asia 5,000 years ago. Polynesians also share cultural traditions, such as religion, social organization, myths, and material culture. Anthropologists believe that all Polynesians have descended from a South Pacific proto-culture created by an Austronesian (Malayo-Polynesian) people that had migrated from Southeast Asia.