Final answer:
Southeast Asia can be divided into mainland and island states.
Step-by-step explanation:
The states of Southeast Asia can be divided into two groups: mainland and island states. The mainland region includes countries such as Burma, Thailand, Laos, and Vietnam, while the insular region includes countries such as Malaysia, Singapore, Brunei, East Timor, Indonesia, and the Philippines. The mainland states are located on the Asian mainland and have extensive river systems, while the island states are made up of islands and peninsulas.