From the left bank of the river Savena, at Ponticella, there are well-evident steep chalky outcrops degrading towards the watercourse in the point where the creek came back to the light after the long subterranean route. Originally, the resurgence had a wonderful entrance crowned by candle-like furrows, which was subsequently destroyed by the quarry activities. The place name "Siberia" recalls the particularly cool microclimate of the area.