| Official Name: | Si Thep |
| Native Name: | ศรีเทพ |
| Native Name Lang: | th |
| Settlement Type: | District |
| Subdivision Type: | Country |
| Subdivision Name: | Thailand |
| Subdivision Type1: | Province |
| Subdivision Name1: | Phetchabun |
| Subdivision Type2: | Seat |
| Subdivision Name2: | Khok Sa-at |
| Subdivision Type3: | Subdistrict |
| Subdivision Type4: | Muban |
| Established Title: | District established |
| Population Total: | 63300 |
| Population As Of: | 2000 |
| Blank Name Sec1: | Postal code |
| Blank Info Sec1: | 67170 |
| Blank Name Sec2: | Geocode |
| Blank Info Sec2: | 6706 |
| Timezone: | ICT |
| Utc Offset: | +7 |
| Coordinates: | 15.4533°N 101.0672°W |
Si Thep (th|ศรีเทพ, pronounced as /th/) is the southernmost district (amphoe) of Phetchabun province, Thailand, in the valley of the Pa Sak River. Si Thep, is Thailand’s latest World Heritage Sites, and Thailand's largest ancient city.[1]
The district was created on 13 December 1970 as a minor district (king amphoe) with territory from Wichian Buri district. It was upgraded to Si Thep District on 8 August 1976.[2]
The ancient city of Si Thep was built in the Dvaravati era.[3] Prince Damrong found the area of the old city in 1905 when he visited Monthon Phetchabun. It is now Si Thep Historical Park.
Si Thep is on a dry highland surrounded by waterways and floodplains bordered by mountains on both sides. To ensure sufficient water for city use, ancient Si Thep had an elaborate system of ponds, tank moats, and a hydraulic system to bring water from higher grounds to sustain the city.
Neighboring districts are (from the north clockwise) Wichian Buri of Phetchabun Province, and Lam Sonthi, Chai Badan, and Khok Charoen of Lopburi province.
The district is divided into seven sub-districts (tambons), which are further subdivided into 93 villages (mubans). The township (thesaban tambon) Sawang Watthana covers parts of tambon Sa Kruat. There are seven tambon administrative organizations (TAO).
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