Answer: The term Indochina refers to the mainland region of Southeast Asia. The following countries are considered part of Indochina: Vietnam, Cambodia, Myanmar, Laos, Thailand, and the peninsula of Malaysia. This term, originally known as Indo-China, was developed during the early 1800’s and used to refer to the geographical areas under Indian and Chinese cultural influence due to its location between the 2 countries. Between 1887 and 1954, it was used as the name of French Indochina, a French colony that consisted of present-day Cambodia, Laos, and Vietnam. Today, the region is more commonly referred to as Mainland Southeast Asia.