This is situated in Wat Khao Noi Si Chomphu, Tambon Khlong Nam Sai,which is 12 kilometers to the South of the city. This ancient venue is on the 80 meter hill. With the Stairs of 254 step, this site is composed of three towers (prang). However, only the central one has been remained. It has been registered in year 1935 by the Department of Fine Arts as the national ancient site. Some sandstone lintels and statues were found, and they are now displayed at the Prachin Buri National Museum.