Nakhon Ratchasima (Thai: นครราชสีมา, pronounced [ná .kʰɔ̄ːn râːt.tɕʰā.sǐː.māː]; Northeastern Thai: นครราชสีมา, pronounced [nà .kʰɔ̂ːn lâːt.sā.sǐː.mâː], often called Khorat is one of Thailand's seventy-six provinces and lies in lower northeastern Thailand also called Isan. At 20,736 square kilometres 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 Chaiyaphum, Khon Kaen, Buriram, Sa Kaeo, Prachinburi, Nakhon Nayok, Saraburi, and Lopburi.