The River Orcia borders the southern boundary of the reserve, which extends on the reliefs in the right-hand side. The territory is dominated by the presence of hilly hills and the fluvial engraving of the Orcia, which flows here in a narrow valley and of considerable landscape interest, with rocky walls overlooking the river, in which nest the Lonely Sparrow.
The well-preserved vegetation that borders the course of the Orcia includes Willows, poplars and Ash Ossifilli, with the presence of rare flora species such as the Marsh orchid, while in the pebbly riverbed dominates the garrigue in Etruscan Santolina. The fauna, still poorly studied, includes many species of the Mediterranean forested areas such as porcupine, wild boar, roe deer, red woodpecker and Green Woodpecker.
The reserve has been equipped with an extensive contiguous area, in order to regulate in a targeted and specific way also the territories left in the river Orcia, very important from the point of view vegetation and floristic.
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