Thai people, who originally lived in southwestern China, migrated into mainland Southeast Asia over a period of many centuries."Siam" may have originated from the Sanskrit śyāma "dark", referring to the relative skin colour of its native people. Thailand is known for its mesmerizing sandy beaches, rich culture and excellent food. The Thaiestablished their own states: Ngoenyang, the Sukhothai Kingdom, the Kingdom of Chiang Mai, Lan Na and the Ayutthaya Kingdom. These states fought each other and were under constant threat from the Khmers, Burma and Vietnam.