The Foglia (also called Isauro) is the northernmost river of the Marche region of Italy. In ancient times it was known as Pisaurus, as it debouched into the Adriatic Sea at Pisaurum (modern Pesaro). The source of the 90km long river is west of Sestino in the province of Arezzo (which is in the Tuscany region of Italy) in the Umbrian-Marchean Apennines mountains. It flows east through an extension of the province of Pesaro e Urbino and then back into Arezzo before forming the border between Arezzo and Pesaro e Urbino. The river then flows into the province of Pesaro e Urbino past Piandimeleto and curves northeast and flows past Sassocorvaro before curving east again. The river meanders south of Montecalvo in Foglia before curving northeast and flowing near Colbordolo, Saludecio, Sant\'Angelo in Lizzola, Montecchio, Montelabbate and Tavullia before entering the Adriatic Sea near Pesaro.
