This khmer sanctuary is at Ban Nong Bua, Tambon Nai Mueang, 3 kilometres from the city. Prang Ku is a Khmer-style ancient site built in the 18th Buddhist century. The main pagoda is square with a length of 5 metres on each side. A stone Buddha image in the meditation posture from the Dvaravati period that was moved from elsewhere is beside it. A building is situated in front of the pagoda surrounded by a wall. Everything is made of laterite except for the door and window frames, the lintel and columns that are made of sandstone. Outside the wall is a pool in perfect condition.