The most widespread migration event, was the Austronesian expansion, which began at around 5,500 BP (3500 BC) from Taiwan and coastal southern China. Due to their early invention of ocean-going outrigger boats and voyaging catamarans, Austronesians rapidly colonized Island Southeast Asia, before spreading further into Micronesia, Melanesia, Polynesia, Madagascar and the Comoros. They dominated the lowlands and coasts of Island Southeast Asia, intermarrying with the indigenous Negrito and Papuan peoples to varying degrees, giving rise to modern Islander Southeast Asians, Micronesians, Polynesians, Melanesians and Malagasy.