Subcarpații de Curbură (Curvature Sub Carpathians), Romania.
The place where the Avars, Bulgarians, Celts, Slavs, Cumans, Gepids, Ostrogoths, Huns, Pechenegs, Sarmatians, Tatars, Turks could not reach, and the Russians will never be able to reach it even if they have tried in the past.