The Indochinese Peninsula, also known as Mainland Southeast Asia, is a geographic region located in Southeast Asia. There are various synonyms for this term, including Indo-China, Southeast Asia, and the Greater Mekong Subregion. Indo-China is often used to refer to the entire region, which includes Cambodia, Laos, Vietnam, and Thailand. Southeast Asia is a broader term that encompasses the Indochinese Peninsula as well as other countries such as Indonesia, Malaysia, and the Philippines. The Greater Mekong Subregion specifically refers to the area encompassing the Mekong River basin, which flows through China, Myanmar, Laos, Cambodia, Thailand, and Vietnam. Regardless of the synonym used, the Indochinese Peninsula is a culturally rich and diverse region with a complex history.