South East Asia, Southeast Asia or Southeast Asia. The region of South Asia Which consists of north China. West India Papua New Guinea East And South Australia The region is located on the junction of several continental plates where there is intense seismic and volcanic eruptions are ongoing. Southeast Asia consists of two geographic regions including Southeast Asia or mainland China, Cambodia, Laos, Myanmar, Thailand, Indonesia, Malaysia, Vietnam and West. Ocean and Southeast Asia comprises Brunei, Malaysia, East Timor - Leste, Indonesia, Philippines and Singapore.