in Italy by Motorcycle, Travel Slow Umbria Italy by Motorcycle: Orvieto’s Etruscans The Umbria town of Orvieto sits atop a plateau of tufa rock—consolidated volcanic ash that we would call “tuff” in English. The rock was thrown from the large crater that is now Lake Bolsena, which we visited four days ago. Posted by Tamela Rich View Post Posted on April 1, 2017