The landscape of the area is volcanic - hills interspersed with wooded gorges, deeply imbedded rivers, hot springs, ancient villages and towns on rocky tuff. About 6 km (3 mi) to the north of Capranica is the crater-lake Vico; at 510 m (1,670 ft) above sea level it is one of the highest major Italian lakes. South of the town, 17 km (11 mi) away is another crater lake, Bracciano, with a perimeter of about 32 kilometres (20 mi); this was ancient Rome’s water supply and is still used for this purpose as one in a system.