Located at about the 20th km off the coastal highway southwards from Alanya. Follow the sign and go past Seki village, ever upwards. After parking your car (or as I did - reaching the end of quite a walk) you come to a well maintained tourist parking spot. I walked from my hotel to Syedra, which officially is a 3,5 km walk and went up to 370 m (I am sure it was more, but oh well). It took turn after turn to get there, but the day was slightly clouded so no problem there. The countryside is dotted with houses and filled with immense banana plantations.
At the parking spot you enter the city through a promising gate which immediately changes into a small path up the mountain. A notion of things to come :-) The through the city wall and quite soon one enters the bathhouse. There should be mosaics on some part of the bath floor, b not found by me.
Push through the bathouse complex (figuratively please) up the stairs, and we enter a columned street. There are shop/store owners niches on the northside walls of the street. Excavations by the Alanya Museum Directorate in 1994 measured this street at 259 x 10 metres. It was probably covered with a wooden roof with it's south side open.
If you climb ever onwards (at the far side of the street) you will find some more remains and parts of houses, temples, and a lost inscription or two. I found the top of Syedra city imposing, with a wide view of the modernized country side and one can imagine the hustle and bustle of (what must have been) quite a city (with minting rights).
I chose to visit what remained of a temple at the end of my explorations (near the starting point). Where I saw a deep Sistern, without any warning signs (as with several less visited spots in Ephesus). So when you walk through these overgrown remains please note : stay on trodden paths, use your eyes and use a (walking/poking) stick ! There are cisterns and/or cellars (underground, covered by long grass) and their holes are NOT marked !
At the seaside there once must have been a harbour, which was/is called Adatas. From there everything (food, articles etc) had to be trannsported (by slaves, no fun !) to the city up the hill. Today no rests remain of the harbour as far as I know.
Excavations indicated the ruins belong to the period between B.C. the 7th century BC and the 13th century AD. No booklets or whatever is for sale in the neighboorhood.
Walking the long path downward I was given a ride by two kind young Turkish men at the back of their motorcycle (I can now state that threee men fit), for which I still am grateful.