Orvieto is a city and comune in the Province of Terni, southwestern Umbria, Italy situated on the flat summit of a large butte of volcanic tuff. The city rises dramatically above the almost-vertical faces of tuff cliffs that are completed by defensive walls built of the same stone, called tufa.
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Official Website http://www.comune.orvieto.tr.it/
Coordinates 42°43'7.015" N 12°6'31.646" E