The Tronto (Latin: Truentus)[1] is a 115-kilometre (71 mi)[2] long Italian river that arises at Monti della Laga and ends in the Adriatic Sea at Porto d'Ascoli, San Benedetto del Tronto.

The source of the Tronto is in the Monti della Laga mountain range in the province of Rieti.

From its source in the Monti della Laga mountains, the Tronto flows northwest near Amatrice and Lago di Scandarello and crosses the border into the province of Ascoli Piceno near Accumoli.

The river continues flowing east near Folignano and eventually forms the border between the provinces of Ascoli Piceno and Teramo near Sant'Egidio alla Vibrata and Castel di Lama.

The river continues flowing east near Spinetoli, Monsampolo del Tronto, and Colonnella and finally enters the Adriatic Sea by Martinsicuro and Porto d'Ascoli.