Seleucia (Greek: Σελεύκεια) – also transliterated as Seleukeia or Seleukheia – was an ancient city on the Mediterranean coast of Pamphylia, in Anatolia, approximately 15 km northeast of Side; the site is currently about 1k north of the village of Bucakşeyhler (also Bucakşıhler), approximately 12 km northeast of Manavgat, Antalya Province, Turkey. It is situated on a hilltop with steep escarpments on several sides making a strong defensive position. The track from the village has recently been clearfelled but the main site is still within a mature pine forest.
The are remains of an agora containing a row of two-storey and 3 storey building facades, a gate, a mausoleum, a Roman bath, a necropolis, in addition to several temples and churches.Because of its remote location,the site has not been plundered for building materials and the area is littered with columns and other items like large grindstones for flour making.
During the late Byzantine era, that is starting in the 8th or 9th Century, Seleucia was the headquarters of one of the Themes in Asia Minor.
In the 1180s the Armenians took control of Seleucia.