What is "arrone"

Arrone is a comune (municipality) in the Province of Terni in the Italian region Umbria, located about 70 km southeast of Perugia and about 10 km east of Terni in the Valnerina.

The Arrone is an Italian river that flows into the Tyrrhenian Sea. Its source is Lake Bracciano. The river flows out of the lake by Anguillara Sabazia and enters the Tyrrhenian Sea near Maccarese and Fregene, localities in the commune of Fiumicino.

There is another Italian river named 'Arrone' that flows into the Tyrrhenian Sea. Its source is near Piansano.