The Chao Phraya Basin or South Central Plains is the historic heartland of Thailand, mostly visited for Bangkok and the archaeological sites of Ayutthaya and Lopburi. Cities Ang Thong Ayutthaya Bang Pa-In Chainat Dan Chang Lopburi Nakhon Nayok Saraburi Sing Buri Suphanburi Other destinations Ko Kret, an island in the Chao Phraya River. Understand Get in Suvarnabhumi Airport in Bangkok city. Get around See Do Eat Drink Stay safe Go next