Bang Sai (, ) is a district (amphoe) in the southern part of Phra Nakhon Si Ayutthaya province, central Thailand. There is another district of Ayutthaya which shares the same romanization Bang Sai, but has a different spelling in Thai.
History The district dates back to khwaeng Sena Noi, which became an amphoe in 1898. It was renamed Ratchakhram in 1923 as the name of central tambon. In 1925 the district office was relocated to tambon Bang Sai, which became the name of the district in 1939.
Geography Neighboring districts are (from the north clockwise) Bang Ban, Phra Nakhon Si Ayutthaya, Bang Pa-in of Ayutthaya Province, Sam Khok of Pathum Thani province, and Lat Bua Luang and Sena of Ayutthaya again.
The main water sources are Chao Phraya and Noi Rivers. The topography of Bang Sai is a lowland area, so it experiences flooding almost every year.
Administration The district is divided into 23 sub-districts (tambons).
No. Name Thai name1.Bang Saiบางไทร2.Bang Phliบางพลี3.Sanam Chaiสนามชัย4.Ban Paengบ้านแป้ง5.Na Maiหน้าไม้6.Bang Yi Thoบางยี่โท7.Khae Okแคออก8.Khae Tokแคตก9.Chang Lekช่างเหล็ก10.Krachaengกระแชง11.Ban Kluengบ้านกลึง12.Chang Noiช้างน้อย13.Homokห่อหมก14.Phai Phraไผ่พระ15.Kok Kaeo Buraphaกกแก้วบูรพา16.Mai Traไม้ตรา17.Ban Maบ้านม้า18.Ban Koบ้านเกาะ19.Ratchakhramราชคราม20.Chang Yaiช้างใหญ่21.Pho Taengโพแตง22.Chiang Rak Noiเชียงรากน้อย23.Khok Changโคกช้าง
Population Bang Sai has a population of about 50,000 people, most of whom are engaged in agriculture, and few of them work in the local industrial factories.
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