Thailand officially the Kingdom of Thailand (Thai: ราชอาณาจักรไทย), formerly known as Siam is a country at the centre of the Indochinese peninsula in Southeast Asia. With a total area of approximately 513,000 km2 (198,000 sq mi), Thailand is the world's 51st-largest country. It is the 20th-most-populous country in the world, with around 66 million people. The capital and largest city is Bangkok.
Thailand is a constitutional monarchy and was a parliamentary democracy until the coup in May 2014 by National Council for Peace and Order. Its capital and most populous city is Bangkok. It is bordered to the north by Myanmar and Laos, to the east by Laos and Cambodia, to the south by the Gulf of Thailand and Malaysia, and to the west by the Andaman Sea and the southern extremity of Myanmar. Its maritime boundaries include Vietnam in the Gulf of Thailand to the southeast, and Indonesia and India on the Andaman Sea to the southwest.