Phraek Si Racha (Thai: แพรกศรีราชา, pronounced [pʰrɛ̂ːk sǐː rāː.t͡ɕʰāː]) is a tambon (sub-district) in Sankhaburi district, Chai Nat province, central Thailand.
Phraek Si Racha is a historic place, its history dates back to around 2,500 years ago, before the establishment of Ayutthaya Kingdom.
This made Phraek Si Racha a water transportation community that could navigate along the Noi river to meet the Chao Phraya in the present-day Chai Nat province, or could travel along other local waterways to the Tha Chin river, where Suphannabhum State (now Suphanburi province) was located.
In short, Phraek Si Racha was a passageway for water travel to larger city-states such as Suphannabhum or Ayutthaya, and could exit to the Gulf of Siam via both waterways.
[2] Phraek Si Racha is also believed to be the native land of Khun San, one of the leaders of the villagers' self-defense force in the Bang Rachan Battle during the end of Ayutthaya Kingdom.