The Măcin Mountains are one of the oldest in Romania, being formed in the second part of the Paleozoic, in the Carboniferous and Permian, during the Hercynian orogeny. The predominant rock is granite. Erosion (caused especially by the difference of temperature) created steep slopes, with the aspect of ruins.
They are divided in Culmea Măcinului (the southern part) and Culmea Pricopanului (the northern part). The highest peak is Ţuţuiatu (also called Greci) which has a height of 467 meters. Other important peaks are Priopcea Hill (410 m) and Muntele lui Iacob ("Mountain" of Iacob - 341 m).
The Romanian Parlament is currently (September 2008) discussing a bill aiming to open 13 National Parks to commercial hunting, in order to eliminate the wildlife from these areas. It is the first step toward the dismantling the National Parks in Romania and them transformation into human settled areas.