The Savio River is a river in northern Italy. Its source is in the western side of Monte Fumaiolo and winds for 96 kilometers along the valley. Its natural track has been preserved relatively well and, in the territory of Cesena, it shows an environment which is one of the purest of the whole Romagna.
The River Savio Natural Park, 6 km. long around a loop which once hosted a cave, starts from the two historical bridges of Cesena.
The park contains many species of animals and plants. The trees divide the area in two belts: the one near the waters contains white willows with black and white poplars; the second presents locust-trees.
Although the Park is relatively small, many animals are visible here, both birds (herons, king-fishers, woodpeckers and raptors) and mammals (hares, porcupines, foxes, roe-deers, etc.).
One of the principal consequences of river water extractions is the variation in and stabilization of the instream flows.
In some rivers the natural flow could always be greater than that which is vitally necessary and for which the adjectives "minimum" and "constant" need be applied; on the other hand, cases, as for example, torrential rivers, in which the natural flow can be less than vital, the generalization would not be appropriate.
In reference to the average hydrologic regime of the SavioRiver, the conditions most critical for the adult stage are verified in the months of July, August and September when the summers low water level reduces the rivers flow to the point of 1-2 m3/s (Tab.4).
An important tributary of riverSavio is river Borrello that flows down Carnaio Pass through a narrow valley, towards the plain, and it meets riverSavio close to the village that has been called after it.
Sarsina's "marmitte" (potholes) are another interesting phenomenon of this land: this is an erosion of the land caused by the course of river Fosso Lagaccio and river Fosso Molinello.
This valley is formed by two distinct elements indicated by the borders between the villages: Mercato Saraceno and Sarsina in the lower part; Verghereto and Bagno di Romagna in the higher course of the river.