It is located in Kesmeburun Village and Bahce Village, 15 km. from Osmaniye. Remains of Kastabala ruins, which start from the foothills of the castle, situated to the east of the highway, which reaches Karatepe-Aslantas ruin via Cevdetiye, Kesmeburun from Osmaniye, cover few square kilometers area was examined in detail for the first time in 1875.
The most important remains of Kastabala ruins, which survived to the present day, are the colonnaded street and the theater with a seating capacity of five thousand persons. Kastabala is one of the most important ruins in Osmaniye and the region with its church, castle, Roman Baths, stadium, necropoli, which surround the city on all sides (rock cut and monumental tombs) and remains of the aqueduct on Ceyhan River, approximately 5 km. northeast of the city.