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.orvieto-info.com/
Address 30 Via del Duomo, Orvieto 05018, Italy
Coordinates 42°43'4.814" N 12°6'40.294" E