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The grouping of Thai provinces into regions follow two major systems in which Thailand is divided into either four or six regions. In the six-region system, commonly used in geographical studies, central Thailand extends from Sukhothai and Phitsanulok Provinces in the north to the provinces bordering the Gulf of Thailand in the south, excluding the mountainous provinces bordering Myanmar to the west and the coastal provinces of the east. The four-region system includes provinces only as far north as Chai Nat, Sing Buri and Lopburi and extends west and east to the borders of Myanmar and Cambodia.
The central region, as defined by Royal Forest Department in 2019, consists of 18 provinces (7 provinces of Greater Bangkok, 8 provinces of South Central Thailand and 3 provinces of Western Thailand). The total area of this central region is 67,473 km2 (26,051 sq mi), while the total forest area is 22,374 km2 (8,639 sq mi) or 33.2 percent of this regional area.
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Administrative divisions
There are several different systems of dividing modern Thailand into different regions, which gives slightly different boundaries for Central Thailand. In the geographic six-region system, the central region includes the following 22 provinces, divided into three groups:
- Greater Bangkok: Bangkok, Nakhon Pathom, Nonthaburi, Pathum Thani, Samut Prakan, Samut Sakhon, Samut Songkhram
- North Central Thailand region: Kamphaeng Phet, Nakhon Sawan, Phetchabun, Phichit, Phitsanulok, Sukhothai, Uthai Thani
- South Central Thailand region: Ang Thong, Ayutthaya, Chainat, Lopburi, Nakhon Nayok, Saraburi, Sing Buri; Suphanburi
The four-region system includes 26 provinces in its definition of Central Thailand. Especially for statistical purposes, they are divided into four groups:
- Greater Bangkok: Bangkok, Nakhon Pathom, Nonthaburi, Pathum Thani, Samut Prakan, Samut Sakhon
- Sub-Central Thailand region: Ang Thong, Ayutthaya, Chainat, Lopburi, Nakhon Nayok, Saraburi, Sing Buri
- Western Thailand region: Kanchanaburi, Phetchaburi, Prachuap Khiri Khan, Ratchaburi, Samut Songkhram, Suphanburi
- Eastern Thailand region: Chachoengsao, Chanthaburi, Chonburi, Prachinburi, Rayong, Sa Kaeo, Trat
The eastern region is sometimes listed as a separate region distinct from Central Thailand: sometimes only the four coastal provincesand sometimes the above list excluding Nakhon Nayok. None of those regions are political subdivisions; they are only geographical or statistical groupings.
Economy
For economic statistics of Central Thailand by National Statistical Office (NSO) the following six provinces are listed: 1.Ang Thong 2.Ayutthaya 3.Chai Nat 4.Lopburi 5.Saraburi 6.Sing Buri
However Nakhon Nayok province is listed by eastern Thailand.
For FY 2018, Central Region had a combined economic output of 863.328 billion baht (US$27.85 billion), or 5.3 percent of Thailand's GDP. Ayutthaya province had an economic output of 412.701 billion baht (US$13.3 billion). This amounts to GPP per capita of 454,953 baht (US$14,676), 40 percent more than Saraburi province, next in the ranking and three times more than for all subsequent provinces in the ranking.
View source data.