Khon Kaen
Khon Kaen is one of Thailand's 76 provinces. It is a triply-landlocked province in central northeastern Thailand. Neighboring provinces are Nong Bua Lamphu, Udon Thani, Kalasin, Maha Sarakham, Buriram, Nakhon Ratchasima, Chaiyaphum, Phetchabun,... Wikipedia
Area: 4,203 mi²
Population: 1.806 million (2018)
Calling code: 043
Capital: Khon Kaen
ISO 3166 code: TH-40
Postal code: 40xxx