Chaiyaphum (Thai: ชัยภูมิ, pronounced [tɕʰāj.jā.pʰūːm]; Northeastern Thai: ไซยภูมิ, pronounced [sa᷇j.jā.pʰu᷇ːm]) is one of Thailand's seventy-six provinces (changwat), located in central northeastern Thailand, also called Isan. Neighboring provinces are (from north clockwise) Khon Kaen, Nakhon Ratchasima, Lopburi, and Phetchabun.
Phetchabun (Thai: เพชรบูรณ์, pronounced [pʰét.tɕʰā.būːn]) is one of Thailand's seventy-six provinces (changwat) and lies in lower northern Thailand. Neighbouring provinces are (from north clockwise) Loei, Khon Kaen, Chaiyaphum, Lopburi, Nakhon Sawan, Phichit and Phitsanulok.
Lopburi (Thai: ลพบุรี, RTGS: Lop Buri, pronounced [lóp bū.rīː]) is a province in the central region of Thailand. The province is divided into 11 administrative districts, and Mueang Lopburi district is the capital. With over 720,000 people, the province is Thailand's 31st largest area and 35th most populous. There are eight neighboring provinces, Phetchabun, Chaiyaphum, Nakhon Ratchasima, Saraburi, Phra Nakhon Si Ayutthaya, Ang Thong, Sing Buri, and Nakhon Sawan.
Lopburi is a significant province historically, where many historical structures, artifacts, and prehistoric settlements have been discovered. In the past, Lopburi was called by the name Lavo.The kingdom had been ruled by an absolute monarch.
Nakhon Ratchasima (Thai: นครราชสีมา, pronounced [ná(ʔ).kʰɔ̄ːn râːt.tɕʰā.sǐː.māː]; Northeastern Thai: นครราชสีมา, pronounced [nà(ʔ).kʰɔ̂ːn lâːt.sā.sǐː.mâː], often called Khorat (Thai: โคราช, pronounced [kʰōː.râːt]; Northeastern Thai: โคราช, pronounced [kʰôː.lâːt]) (alternate spelling Korat) is one of Thailand's seventy-six provinces (changwat) and lies in lower northeastern Thailand also called Isan. At 20,736 square kilometres (8,006 sq mi) it is the country's second largest province by area, has a population of approximately 2.6 million, and generates about 250 billion baht in GDP, the highest in Isan. Neighbouring provinces are (clockwise, from north) Chaiyaphum, Khon Kaen, Buriram, Sa Kaeo, Prachinburi, Nakhon Nayok, Saraburi, and Lopburi.
The capital of the province is the city of Nakhon Ratchasima in Mueang Nakhon Ratchasima district, also called Khorat.