The "Marmitte dei Giganti," or "Giant's Kettles," are natural geological formations found in the Valle del Fiume Ceno in Italy. These large, bowl-shaped depressions were created by the erosive action of water and sediment over thousands of years. They are typically formed in riverbeds and are characterized by their smooth, rounded edges. These unique formations are often associated with local legends and folklore, which attribute their creation to giants. The site is popular among hikers and nature enthusiasts, offering stunning views and opportunities for exploration in the surrounding Appennine Mountains.