The river Treja runs among spurs of volcanic origin crossed by several minor watercourses, its tributaries. The area is characterized by a characteristic "Etruscan" landscape, with deep-carved gorges and overhanging tufaceous walls. In Monte Gelato, the river Treja branches off in a series of small waterfalls to gather then again and enter the ravine. Here, men built in the past a tower and a mill for their needs, without disturbing the landscape. In the ravine, several spurs, elevations, and promontories of different volcanic rocks form charming settings and give life to landscapes with different vegetation. Several springs - also with mineral and ferruginous water - feed the watercourse.