Thailand ( or ; , ), officially the Kingdom of Thailand (, ; ), formerly known as Siam (; ), is a country at the centre of the Indochinese peninsula in Mainland Southeast Asia. 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.