Prasat Prei (GPS: 13.46771, 103.87714) is a small, insignificant Angkor temple located on the opposite side of the road from Neak Pean. It was built in the late 12th and early 13th century during the reign of King Jayavarman VII. Prasat Prei consists of a pair of laterite towers, or prasats. Prasat Prei is adorned with carvings of apsaras as well as other carvings.
I was the only visitor to Prasat Prei when I visited. It was so off the beaten path that nobody checked my Angkor pass. However, I saw that even here, the grass was neatly cut and the ruins well maintained. After visiting Prasat Prei, I continued down the same path to visit another related ruins, Banteay Prei.
Prasat Prei is a minor temple that will only be of interest to those with time and specific interest in studying Angkor indepth. It is located on the left (north) side of the road that runs between Preah Khan and Neak Pean. Be on the look out for a left-turn with a signboard saying Prasat Prei and/or Banteay Prei. If you need transport, I can recommend the tuk tuk driver who drove me there. His name is Mr Han (see contact below), and you can call to see if he is available to take you.