Foglia
The source of the river is west of Sestino in the province of Arezzo ( which is in the Tuscany region of Italy ) in the Appennino Umbro-Marchigiano mountains . 
<triplet> Sestino <subj> province of Arezzo <obj> located in the administrative territorial entity <triplet> province of Arezzo <subj> Sestino <obj> contains administrative territorial entity <subj> Tuscany <obj> located in the administrative territorial entity <triplet> Tuscany <subj> province of Arezzo <obj> contains administrative territorial entity