The southern-most province of the North, Uthai Thani covers an ares of approximately 6,730 square kilometres which is mainly basin plains fed by the Chao Phraya and Sakaekrang rivers. To the west are ranges of mountains with a vast area of lush jungles bordering on Kanchanaburi province. The diverse natural terrains are preserved as wildlife sanctuary and designated as world heritage sites. There is evidence that some of the land was once pre-historic human settlements and sites of several ancient communities during the 1,000-year-old Dvaravati era.