Very small stream (locally known as “rio”) carving its way through a tufa land and often disappearing covered by luxuriant vegetation. The territory is dotted with this kind of water creating the “Forre”, deep valleys where the Etruscan civilization had its roots. They rarely have trout: the water temperature is always too high for this fish. Chub, barbel and trout can be found. The water is sometimes milky in appearance because of the nature of tufa, releasing micro particles of material into the water. Due to the abundance of the riparian vegetation, casting may pose problems.