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"Thailand is a vast country comprising 513,115 sq. km of land and more than 3,219 km of coastline. Thailand is divided into four natural regions: The mountainous North; The high Northeast Plateau; The Central Plain; and the Southern Isthmus or peninsula. Thailand comprises 76 provinces and stretches 1,648 km from the Northern most point of Mai Sai to the Southern most point of Tanon Sukyang, and has a width of 780 km."
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Thailand is about as big as the state of California in land area, maybe a little smaller, maybe a little larger but by comparison, the golden state is closest to Thailand in size and should give an indication of Thailand's size.
Thailand is 198,117 square miles in size. This is 513,120 square kilometers. It is about twice the size of the state of California.