Thailand....
...is the answer.
Siam now called Thailand; the Gulf of Siam, now called the Gulf of Thailand.
The Gulf of Mexico is the only gulf bordering the continental United States. It lies to the south and southeast of the country, and is known for its warm waters, diverse marine life, and popular coastal cities like New Orleans and Miami.
Saudi Arabia just edges out Iran.
Saudi Arabia
Gulf of Mexicio
Kuwait borders the Persian Gulf. It begins with the letter K.
Gulf of Mexico
Doha is the capital city of Qatar, a country bordering the Persian Gulf in western Asia.
United Arab Emirates is a country in the Middle East bordering Oman and Saudi Arabia ((arabian) Gulf country) on the continent of Asia.
That point is in the Gulf of Thailand, about 198 miles south of the center of Bangkok.
Cambodia, Thailand and Vietnam.
The country of Siam, which changed its name to Thailand in 1939.It was the country of Siam - which is now called Thailand.