Southeast Asia Cambodia A country in Southeast Asia. The country borders Thailand to its west and northwest, Laos to its northeast, and Vietnam to its east and southeast. In the south it faces the Gulf of Thailand. LanguaL curation note: US FDA 1995 Code: KH kampuchea Country Southeast Asia Cambodia A country in Southeast Asia. The country borders Thailand to its west and northwest, Laos to its northeast, and Vietnam to its east and southeast. In the south it faces the Gulf of Thailand. LanguaL curation note: US FDA 1995 Code: KH kampuchea