I have just come back from Turkey, where we spent there nights (~20 hours total) turning the 13-km road-accessible stretch of the Manavgat river valley around Üzümdere upside down, still with no owls. We even met a guided group - while the guide was obviously keen for the guests to avoid any contact with us, one of the birders defied him and chatted us up a bit - he was quite surprised to hear we were there independently, because he thought that it's not possible to find the sites without the tour agency, but they are simply posted on observation.org. But I am not sure it's possible to find the owl
(no idea if they saw it, but they did not come back for the next night).
Nevertheless, it's one of the most beautiful places I have ever been to, with sycamore trees lining the emerald clear karstic waters just starting to put on leaves.