The area is dominated by Poggio Pampagliano (969m), which with Poggio La Roccaccia and Poggio Roccone, a little lower, forms a curved ridge towards the north-east, working as a watershed between the basins of the river Paglia and the river Fiora. The Reserve protects a heterogeneous woodland rich in vegetal species, where the spontaneous presence of the Silver Fir is particularly significant. Pigelleto wood is mainly a high-trunk tree wood, deriving from the kind of cutting it was practiced during the mining activity period, which has probably contributed to maintain the spontaneous renewing of the Silver Fir.