Uthai Thani is one of the provinces of Thailand. Neighboring provinces are (from north clockwise)Nakhon
Sawan, Chai Nat, Suphan Buri, Kanchanaburi and Tak.
The province stretches from the low plains of the Chao Phraya river valley, to mountains covered with forests in the west. The Sakae Krang River, a tributary of the Chao Phraya River is the main river of Uthai Thani province.
       The Huai Kha Khaeng Wildlife Sanctuary at the western boundary to the province Tak and was declared World Heritage in 1991. It covers 2,574 km², and houses almost all of the forest animals of South-East Asia, including tigers and elephants Originally Mon and Lawa settled in the area. A first Thai settlement in the area was Muang U Thai during the Sukhothai period, but was later abandoned when the river changed course. Patabeut, a member of the Karen ethnicity, revived the settlement at its currect place during the Ayutthaya period. It served as a fort protecting the boundary of the kingdom then.