In your original post you ask about "Southern Turkey".
By that I would suspect you mean from Bodrum (roughly 37deg N) to Finike (roughly 36 deg, 18 min N) a distance of some 300Nm if you go in and out of all the gulfs in between. This covers the Carian Coast and the Lycian Coast.
The are many good and safe anchorages
along these coasts.
In Gokova Korfezi (Bodrum area) there are anchorages
on both north and south side of the gulf. Such places as English
Harbour, an anchorage on the south with all round protection.
Next would be Hisaronu Korfezi which covers Datca through to Bozborn, again with anchorages north and south. South side has Keci Buku (Orhaniye) all round shelter and a Marina if needed (Marti Marine).
Marmaris Bay. Somewhere in the bay you will get shelter from the nasty wind
direction. Plus a number of Marina's, a town quay and lts of shops, chandlers etc.
Gocek / Fethiye (Fethiye Korfezi). Too many anchorages to name. Fethiye has at least 2 Marina's and Gocek at least 3. Good all round shelter and lots of shops etc.
Kas, Kekova Roads & Finike. Again in this area there are 2 marinas
(Kas & Finike) a town harbour (Ucagiz) with total all round shelter and loads of anchorages.
Day hops from one Gulf to another would be a max of 40Nm.
Many people have wintered in and around these areas with no problem. Just need to keep an eye out for bad weather
and pick the right location. If need be you will be no more that some 20 mile from a marina.
The biggest problem you will have is only being able to spend 90 days in 180 days in Turkey. But if like me and many others you believe winter to be December, January & February and you intend to go to South Africa
for a few week which will obviously extend your period you will be fine.
If you started from the East (Finike) then worked to the West you can then start going up the Eastern Greek Islands
. Symi, Kos, Samos etc.
This area is very wet in the winter and can get cold. Suggest to get Rod Heikell's - Turkish Waters & Cyprus
Pilot. Lots of good info even if somewhat out of date.
We have spent since 2010 in and around this area so talk from experience.