Capranica is a comune (municipality) in the Province of Viterbo in the Italian region Lazio,
The municipality of Capranica lies at the foot of extinct volcanic mountains, the Cimini and Sabatini. 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.
John Evelyn mentions the town in passing:
After dinner we took horse by the new way of Capranica, and so passing near Mount Ciminus and the Lake((Almost certainly Lake Vico —GS)), we began to enter the plains of Rome; at which sight my thoughts were strangely elevated, but soon allayed by so violent a shower, which fell just as we were contemplating that proud Mistress of the world, and descending by the Vatican (for at that gate we entered), that before we got into the city I was wet to the skin.