[lago di vico] is a caldera lake located in the northern Lazio region of central Italy, in the province of Viterbo. It is one of the highest major Italian lakes, situated at an altitude of about 510 meters above sea level. The lake lies within the Lake Vico Natural Reserve and is surrounded by the Cimini Hills and mountains including Monte Venere and Monte Fogliano. Its volcanic origin dates back to the collapse of a volcanic cone roughly 138,000 years ago. The area is known for its rich biodiversity and extensive beech forests, and it serves as an important habitat for many bird species and other wildlife. The lake's northern wetland is particularly significant for birdwatching. It has clear waters reaching depths of up to 45 meters and supports pike, perch, whitefish, and various other fauna. The surroundings include hazel groves and forests consisting of oak, chestnut, and beech trees. Human interventions, including an artificial outlet tunnel dating from Roman times, have altered the lake's water levels and landscape over the centuries. Nearby towns include Caprarola, known for the Renaissance Palazzo Farnese, and the area is a destination for nature walks, birdwatching, and gentle outdoor recreation in a largely intact natural environment.