The Marocche di Dro consist of a large debris calcareous sedimentation, with blocks of different sizes. Within the Marocche there is a depression with a small lake bordered with Phragmitetum australis and Cladietum marisci, which was originated by a barrier caused by a landslide and called Lago Solo. There is a mainly pioneer vegetation, typical of the cracks in the rocks and of the debris.