The harbor which is known to have served the settlement, a small fishing town in the 4th century B.C. and has a natural and sheltered settlement indentation about 200 m. in diameter is today one of the entertainment centers of Antalya, in addition to it being a sheltered area for sightseeing and fishing boats, a city of yachts today. The port gained military and commercial importance in the early 2nd century B.C. was an important factor in the establishment of Attelia known as Kaleiçi today. Also for a short time in the 2nd century B.C. it was seized and used by the Cilician Pirates. The harbor was among the most vibrant ports of the Eastern Mediterranean during the Roman period and particularly in the Byzantine and Seljuk periods, it was an important trade port, an established link for mariners travelling to Egypt and Syria. As well its importance in the sea trade between Egypt and Constantinople, it had important port revenues from the trade in products such as timber, olives, cereals, textiles, tar and citrus which produced around the city or sourced from inland. A shipyard built during the Seljuk period increased the harbor’s importance. Probably a big tower was constructed between the breakwater and the harbor entrance in the Byzantine period, the port opening closed with a chain stretched across as required. At the beginning of the 16th century the port lost to a great extent its former importance, later Ottomans dominance in the Eastern Mediterranean in particularly the conquest of Egypt turned it into a safe area where trade gained momentum. Followed by the construction of a commercial harbor to the west of Antalya at the beginning of the 1970’s firstly the fishing boats, and then with the developing tourism in the 1980’s it became known as the yacht harbor. At the port where the large tower at the entrance was recorded in ruins at the beginning of the 20th century, a customs house and a large flour mill were built. These buildings and the tower remains were removed from their place in harbor renovation works that were applied at the end of 1960.