The Temple on the river Clitunno is located in the nearby town of Campello Sul Clitunno. The best description of this magical place it is due to Pliny the Younger in 108 AD
"You have not seen the source of the Clitunno? If not - and I do not think, otherwise you would have talked to me, go and see it. I just saw him and I regret having done so late. There, a small hill across covered and shaded by magnificent cypress trees, and at his feet a set of plates with irregular leaking here and there water so pure and clear that you can see each coin that was thrown ... near an ancient temple and worshiped . And inside, the god of the same name, Clitunno, wrapped in robes that adorn it. "