Everyone in Thailand speaks Thai.
When people talk about the Thai language they are really referring to a Central Thai dialect that has succeeded in becoming the standard official language for the whole country. For this reason Thai is only spoken as a first language in the central provinces of the nation. As Thai is the official language of education, government and media it's basically understood from North to South although recent estimates suggest that less than half the population of Thailand speak and understand Thai fluently.
Thailand is the Land of Smiles. A grin shows companionship. A laugh shows forgiveness. But what if you need a second-class train ticket from Bangkok to Chiang Mai? Keep smiling - this phrasebook will show you the way.