Vértes is a mountain range in north-western Hungary, in the Central Transdanubian region, between the ranges Bakony and Gerecse. The Vértes Mountains are part of the Transdanubian Mountains. Area of the Vértes occupies 314 km². It is about 30 km long and 11c12 km wide. The average altitude is above sea level is 350 meters, in highest points are 487 m (Nagy-Csákány), 480 m (Körtvélyes) and 479 m (Csóka-hegy). Geologically the Vértes constitute a fairlyuniform structure. On the surface of the eptire mountain there are no older rocks than those of the mid-Triassic. The main rock is dolomite—CaMg(CO₃)₂—from the upper Triassic.