Southeast Asian studies (SEAS) refers to research and education on the language, culture, and history of the different states and ethnic groups of Southeast Asia. Some institutions refer to this discipline as ASEAN Studies since most of the countries that they study belong to the Association of Southeast Asian Nations or ASEAN. Definitions of what constitutes Southeast Asia differ between scholars, which blurs the boundaries between Southeast Asian studies and other regional studies like Oriental studies and post-colonial studies. Southeast Asian studies incorporates anthropology, religious studies, linguistics, and international relations.