The Sema City plan, which is egg-shaped, covers an area that is 3 kilometers wide and 4 kilometers long. The city was built around the 12th Buddhist century, flourished during the Dvaravati period and grew until the 16th-17th Buddhist centuries when it came under Khmer influence. Visitors can still see evidence of city moats, earth walls, laterite and sandstone ruins and numerous artifacts. The most interesting ones are the reclining sandstone Buddha image and an old religious relic that is now in Wat Thammachak Semaram.

The site is in Tambon Sema, about 37 kilometers from the city. From Amphoe Sung Noen cross Lam Takhong River past Ban Hin Tang to Sema, which is 4 kilometers away.