Cascata delle Marmore - Terni - Umbria - Italy Waterfall marmore Height 165 meters The Cascata delle Marmore is a waterfall with controlled flow, inserted in a large natural park, among the highest in Europe, being able to count on a total difference in height of 165 m, divided into three jumps. It is located about 7.5 km away from Terni, in Umbria, almost at the end of Valnerina, the long valley carved by the river Nera. The name derives from calcium carbonate salts found on rocks that are similar to white marble.