Ciottoli

Also River-Rocks

River-rocks have a long history as a paving material, mostly because they were available without any further processing: just the selection of size and color. Nowadays, they are used both for paving and for wall cladding, even though the first use is mostly to complement sidewalks, or pathways. As a wall cladding option, they are usually split in two halves and installed with the split face visible.