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Central Thailand edit
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Central Thailand (Central Plain) is a region of Thailand, covering the broad alluvial plain of the Chao Phraya River. It is separated from North-East Thailand (Isan) by the Phetchabun mountain range, and another mountain range separates it from Myanmar to the west. In the north it gently changes into the more hilly Northern Thailand. The area was the heartland of the Ayutthaya kingdom, and is still the dominant area of Thailand. Central Thailand contains the Thai capital of Bangkok. Central Thailand is the most populated region in the country.
The grouping of Thai provinces into regions follow two major systems, in which Thailand is divided into either six or four regions. In the six-region system commonly used in geographical studies, Central Thailand extends from Sukhothai and Phitsanulok Privinces to the north to the provinces bordering the Gulf of Thailand to the south, excluding the mountainous provinces bordering Myanmar to the west and the coastal provinces of the East. The four-region system covers provinces only as north as Chai Nat, Sing Buri and Lop Buri, and extends west and east to the borders of Myanmar and Cambodia.
Central Thailand, as defined by the four-region system, is divided into 26 provinces. Especially for statistical purposes these are divided into 4 groups1:
The eastern region is sometimes listed as a separate region destinct from central Thailand - sometimes only the four coastal provinces, sometimes the above list excluding Nakhon Nayok. None of these regions are actually administrative subdivision, they are only geographical or statistical groupings.