It can be divided into two parts: the main Balkan Chain and the Pre-Balkans to the north, which intrude slightly into the Danubian Plain.
On top of the Serbian part is this rock called "Babin Zub" (Grandmother's Teeth).
The surrounding are part of a ski recreational area in winter and full of nice hiking trails in summer.
I just took a few pictures while cruising around. I arrived by night at Babin Zub's Hotel after a drive through dark roads and the navigation telling that theres nothing further along. I really had no idea were I landed.
The next day I was surprised with a nice scenery while driving to see the newly errected just opened Hotel Stara Planina.
Also the new Hotel was a pleasant surprise, instead of an overstated giant facility with no relation to the surrounding, the building looks solidly adapted to the rough mountain setting from the outside and the interior is appropriately stylish.
After visiting the area in summer, I now would like to visit the area in winter.
Eastern Serbian mountains are as beautiful as the Western Serbian mountain (I wrote about those mountains here in my posts about the unique National Park Tara "Best travel tips for Serbia - TARA/KOPAONIK" and "Tara National Park in Western Serbia", the Ethno Village Sirogonjo "Etno Selo - Sirogonjo", the posts about the Zlatibor region: "More Ethno in Zlatibor", "Mokra Gora" and Ethno Village Mecavnik "Kusturica made it!".