Thommanon sanctuary is around 500 meters east of the Victory Gate. A sanctuary dedicated to Brahmanism, it was worked in the late eleventh and" mid twelfth hundreds of years by King Suryavarman II. 

The sanctuary is rectangular in design with an asylum open¬ing" toward the east, a canal and a bulwark with two gopuras, one on the east and another on the west, and one libray close to the south-east of the divider. Just followed of a laterite base of the divider remain.