The town of Selinus was supplied by a water pipe, which carried the water over long distances via an aqueduct. Some parts of this aqueduct have been preserved, some of them hardly recognizable as such.

Selinus, at times Traianopolis, was an ancient city in Rauen Kilikien (Kilikia Tracheia) near today's city Gazipaşa, eight kilometers southeast of the ancient city of Iotape.
Little is known about the history of the city until Roman times. In 197 B.C. it was subdued by Antiochos III. In 117 AD the Roman Emperor Trajan died there on his way back from the war against the Parthians. After him, the town was renamed Traianopolis, but in late antiquity, when it was the seat of a bishop, its old name was restored.
In 269 the Persians conquered the city, and in the 5th century it was affected by the Isaur riots.

The city lies on a mountain at the mouth of the river Selinus (today Musa Çay) and spread into the plain in Roman times. Remains of the city wall, an aqueduct and a theatre have been preserved. A building standing on a square surrounded by colonnades (so-called Şekerhane Köşkü), which is called the cenotaph of Trajan, is probably Seljuk in its present form, but probably stands in the place of the cenotaph, a building of Corinthian order, of which numerous spolia have been reused. The well-preserved castle on the Acropolis is a small Armenian fortress from the 12th century.