Điện Biên Phủ(, meaning: "Established Frontier Prefecture"), is a city in the northwestern region of Vietnam. It is the capital of Điện Biên Province. The city is best known for the decisive Battle of Điện Biên Phủ, which occurred during the First Indochina War of independence against France. The region is a center of ethnic Thai culture. In prior history, the city was formerly called Muang Thaeng.