Pyramids of Zone Regional Natural Reserve in the area of Cislano - - - These pyramids represent a real nature masterpiece and are the result of a rare erosion phenomenon in partly cemented clay-gravel deposits, including big rocks of petrified sediments. The rainwater rapidly washed away the clay matrix of the deposits from the mountain slopes thus isolating little by little the rocks which are left to protect the material below like umbrellas. So, the gravel deposits that form the moraine gave origin to the “pyramids”, earth pinnacles surmounted by rocks.