The Adio stream
nestled in dense vegetation
About half of its course crosses the Monterufoli-Caselli Nature Reserve. It is a natural stream surrounded by thick vegetation with short stretches on rocks.
The path that leads to the stream descends through woodlands rich in various kinds of vegetation and animals.
The common wood pigeon can be found noisily flying in the valley of Adio and many are accompanied by the loud cry of the European green woodpecker. Wild boars are a common sight.
Of interest there is much to see along the stream but unfortunately there are no paths to get there; especially the beautiful waterfalls at the junction with Vallon Cupo, below the village of Libbiano.