Civitella del Lago is a village in the Italian region of Umbria, administratively a frazione of the commune of Baschi. It is located just above Corbara lake , an artificial lake on the course of the river Tiber. The inhabitants during the winter are about 300 growing in summer to more than 700. There are sights of the Tiber Valley and the province of Viterbo, and on clear days it is possible to see as far as the hills above the Tyrrhenian Sea.[citation needed]