[2] The volcanic crater with a diameter of 10 km is bordered by the highest peaks, and to north is split by Valea Neagră, a tributary of Dorna River.

Inside the crater there are several secondary volcanic funnels (Pietricelui, Vârful Haitei, Negoiul Românesc), the last one being a exploitation of sulfur until 1997.

[3] Intense Neogene volcanic activity led to the emergence of huge accumulations of lava spread over a length of 450 km (of which 375 in Romania).

The area in which lies the mountain range overlaps Țara Dornelor, a region where nature and folk traditions blend.

During the summer, they can practice river rafting, mountain biking, paragliding or zip lining.