I've spent a lot of time in the Durmitor mountains (exploring new caves) and I think quite a bit has been climbed because there are a lot of keen mountaineers in the former Jugoslavian countries. I dont think its that well documented though so maybe you will be new routing maybe you won't ,much like climbing in Norway.
Enjoy! There is a huge underground river system under the Durmitor mountains and I spent a bit of time exploring it (York Uni may have been the first to discover it, after we found a cave entrance and abbed down 650 meters, but we're not sure if another cave discovered by Belgrade Uni goes to the same river or not).
Watch out for the local moonshine its lethal! You might find a kind of apricot brandy which is nicer than the plum version.
Belgrade University Alpine Climbing and Caving Club (ASAK when translated into Serbian) will know a lot about the area and are a friendly lot, maybe they'll help you out. They dont check emails much so if they dont reply send me a PM.
I've been ski touring in the Prokletje mountains in Montenegro and Albania and thought the climbing potential looked amazing. Difficult to tell about the rock quality but there was a lot of it! No hard information I'm afraid but it was a beautiful place and would be a big adventure. https://www.ukhillwalking.com/images/dbpage.php?id=96804
I haven't been there but flew over the area in the autumn. The Dinaric Alps look interesting.
I found a site on a long distance path, which has a basic map feature which may be useful to you. It is scrollable to show contours and paths, but doesn't show cliffs.
There is a small backpackers hostel in Zabljak, at the foot of the Durmitor mountains. The guy who runs it is an outdoor enthusiast and knows the area well, he had lots of good hiking suggestions when I was there. Don't know if he is a climber, but he might be able to point you towards some locals who know more about the climbing in the area. Email is hikersden@live.com.
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