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Nakhon Ratchasima is the capital of Nakhon Ratchasima province, the largest city in Northeastern Thailand and the third-largest city in Thailand. It is 250 km northeast of Bangkok, one of the four major cities of Isan, known as the "big four of Isan", and has a population of 466,098 people as of 2021. The city is commonly known as Korat, a shortened form of its name. Korat is at the western edge of the Korat Plateau. Historically, it once marked the boundary between Lao and Siam territory. It is the gateway to the Lao-speaking northeast of Thailand.