The small artificial lake collects the water flows from the Piano Brook, which descend from the Cavone Glacial Cirque. Beech forests surround the lake and are spotted with various picnic areas.
The Cavone Glacial Cirque is the most clearly noticeable example of the glacial landforms present in the park. The cirque was molded during the Würm, the last glacial stage within the Quaternary Period (between 70,000 and 10,000 years ago), from a glacier that formed between the Corno and the La Nuda mountains and whose erosive forces acted over time to carve out a deep bowl shape. The Cavone Cirque is a relict landform: under current climatic conditions, it tends to lose its characteristic shape ever so slowly and, as with other landforms inherited from previous periods of geomorphic processes, it is worthy of special protection. The Cavone Spring is located at the bottom of the cirque and its waters form the Piano Brook, then collect in the artificial lake next to the mountain hut before continuing their course towards the Dardagna Stream.