Central Thailand

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Central Region ภาคกลาง
Region
From upper-left to lower-right: Lumphini Park; Wat Chaiwatthanaram; Fishing, Bueng Boraphet; Wat Mahathat Sukhothai Historical Park; Khao Kho National Park
Central Region in Thailand
Largest city	Bangkok
Provinces	21 Provinces 1 Special administrative area Bangkok Nakhon Pathom province Nonthaburi province Pathum Thani province Samut Prakan province Samut Sakhon province Samut Songkhram province Kamphaeng Phet province Nakhon Sawan province Phetchabun province Phichit province Phitsanulok province Sukhothai province Uthai Thani province Ang Thong province Phra Nakhon Si Ayutthaya province Chai Nat province Lopburi province Nakhon Nayok province Saraburi province Sing Buri province Suphanburi province
Area
• Total	91,798.64 km2 (35,443.65 sq mi)
Population  (2015)
• Total	20,183,134
• Density	220/km2 (570/sq mi)
GDP [1]
• Total	US$286.7 billion (2019)
Time zone	UTC+07:00 (ICT)
Language	Thai • others

Central Thailand (Central plain) (historically also known as Siam or Dvaravati) is one of the regions of Thailand, covering the broad alluvial plain of the Chao Phraya River. It is separated from northeast Thailand (Isan) by the Phetchabun mountain range. The Tenasserim Hills separate it from Myanmar to the west. In the north it is bounded by the Phi Pan Nam Range, one of the hilly systems of northern Thailand. The area was the heartland of the Ayutthaya Kingdom (at times referred to as Siam), and is still the dominant area of Thailand, containing as it does, the world's most primate city, Bangkok.