SE Asia is a subregion of Asia, consisting of the countries that are geographically south of China, east of India, west of New Guinea and north of Australia. The region lies near the intersection of geological plates, with heavy seismic and volcanic activity. Southeast Asia consists of two geographic regions:
Maritime Southeast Asia, comprising Indonesia, East Malaysia, Singapore, Philippines, East Timor, Brunei, and Christmas Island.
Mainland Southeast Asia, also known as Indochina, comprising Cambodia, Laos, Myanmar (Burma), Thailand, Vietnam, and West Malaysia;
Historically, many societies in East Asia have been part of the Chinese cultural sphere, and East Asian vocabulary and scripts are often derived from Classical Chinese and Chinese script. Sometimes Northeast Asia is used to denote Japan and Korea. Major religions include Buddhism (mostly Mahayana), Confucianism or Neo-Confucianism, Taoism, Chinese folk religion, Islam in China and Taiwan, Shinto in Japan, Shamanism in Korea, Mongolia and other indigenous populations of northern East Asia, and recently Christianity in South Korea.The Chinese Calendar is the root from which many other East Asian calendars are derived.- Wikipedia