The historical importance of Cambodia in mainland Southeast Asia is out of proportion to its present reduced territory and limited political power. Between the 11th and 13th centuries, the Khmer (Cambodian) state included much of the Indochinese mainland, incorporating large parts of present-day southern Vietnam, Laos, and eastern Thailand. The cultural influence of Cambodia on other countries, particularly Laos and Thailand, has been enormous. For a discussion of Cambodian history in its regional context, see Southeast Asia, history of.