Southeast Asia consists of two geographic regions: the Asian mainland, and island arcs and archipelagos to the east and southeast. The mainland section consists of Cambodia, Laos, Myanmar, Thailand and Vietnam; the population of which are primarily Tai peoples and Austroasiatic peoples; the dominant religion is Buddhism, followed by Islam. The maritime section consists of Brunei, East Timor, Indonesia, Malaysia, the Philippines and Singapore. Austronesian peoples predominate in this region; the dominant religion is Islam, followed by Christianity.