The relief bears the mark of geological and lithology structures. The central subunit of Ceahlău Mountain is an enormous suspended depression on Ceahlău Conglomerates. The superior plateau corresponds with the arched surface of the depression, whose extremities are also the highest in altitude: Ocolaşul Mare peak (1907 m) in the southernmost part and Toaca peak (1904 m) in the northernmost part. Between the two peaks, the plateau crosses approximately 5 km in length and 1 km in width.
The plateau is limited by tall slants reaching 200-300 m, grooved by avalanches, shingles of rolling debris, dark vents. The most impressive slants can be found at the origin point of Izvorul Muntelui and Maicilor Rivers, as well as in Piatra Sură. In some cases, the walls of the slants are fragmented in steps, which bear the local name of “poliţe”. They are well known as “Poliţele cu crini” and those behind Ocolaşelor.
Another characteristic is the micro-relief formed by rocks with bizarre shapes: towers, columns, reeks or pyramids. Their ruinous aspect is due to the erosion of the conglomerates, as well as to their alternation with grindstones and adobe stones. Impressive are Clăile lui Miron, Căciula Dorobanţului, Panaghia, Cetăţuia şi Călugării, Detunatele, Dochia, etc. Piatra Sură, Bâtca Neagră peak is also imposing in aspect, being similar to a “pole” of rocks that rises nearly vertically (hog-back), which closes the beautiful Stănilelor Glade to the west.
In the gray matter of the conglomerate, the white rocks of some adobe klippes stand out (enormous adobe rocks sedimented in the conglomerates), situated on Piatra cu Apă, Ocolasul Mic plateau or Izvorul Alb valley (the well known Dochia Rock).
A considerable train of debris formed at the base of the slants, surrounding the conglomerates and covered in dark pine forests. Gigantic blocks of stone, fixed and masked, frequently detach in the conglomerates, mainly due to the forest vegetation, some reaching impressive extents.
Peripheral subunit: the elongated peaks of Munceii Ceahlăului can be seen surrounding the tall central part of the mountain. Formed of rocks less resistant to erosion, they are arranged in an alternance of taller peaks (named “bâtcă”), separated by “saddles” (locally known as “curmături” or “tarniţe”). Mostly forested, the peaks do not surpass 1300m in altitude and cross the limits of Ceahlău National Park, towards the main valleys that surround the mountain.