Once known as Siam, for 10 points, name this country of Southeast Asia with capital at Bangkok.
This country's southernmost province of Patani has been the site of insurgency since 2004. The Tenasserim Hills along this country's western border contain the Three Pagodas Pass, and this country was once home to a state known as Lanna, which was also called the Kingdom of a Million Rice Fields. This country's eastern region of Isan rests on the Khorat Plateau, and Chiang Mai is its largest city in the north. This country's capital lies on the Chao Phraya River, which flows into its namesake gulf, an arm of the South China Sea. This country's capital was moved to Thonburi by Taksin after the sacking of Ayutthaya. This country shares the Kra Isthmus with its western neighbor Myanmar, and the Malay Peninsula with Malaysia. Once known as Siam, for 10 points, name this country of Southeast Asia with capital at Bangkok.
This country's southernmost province of Patani has been the site of insurgency since 2004.
Kingdom of {Thailand} [or {Ratcha Anachak Thai}]