tɕʰā ʔāːnāːtɕàk tʰāj ) ( listen ) ) , formerly known as Siam ( Thai : สยาม ; RTGS : Sayam ) , is a country located at the center of the Indochina peninsula in Southeast Asia .
tɕʰā ʔāːnāːtɕàk tʰāj ) ( listen ) ) , is a country in Southeast Asia .