in Ancient Geography, a river of Umbria, on this side the Apennines. According to Pliny, it was a fountain consisting of several veins, situated between Hispellum and Spoletium; which soon after swelled into a very large and navigable river, running from east to west into the Tinia, and both together into the Tiber. A river famous for its milk-white flocks and herds, (Virgil). The god of the river was called Clitumnus.