How to get there:
Taking the SS 513 you get on the road that leads to the Tassobio Valley in two different points: in the location Buvolo, on the northern boundary of the town, close to the bridge over the same Tassobio torrent, which you will follow right from the beginning, or in the fraction of Rosano, in this case taking the longer route.
The eastern area of Casina municipal territory has not an historical and scenically homogeneity; the only common feature is the hydrographic one: almost the whole of it belongs to the Tassobbio basin, even if it does not occupies completely its top tract. But as for everything else (geologic substratum, vegetation genres, landscape, settlements history) there are such differences that make even more interesting the discovery by walking, through a rich and developed track network.
In the north, above Cortogno, a series of high and isolated reliefs constituted by the "Arenarie di Bismantova" formation, ends to the plain, dividing it from the Ciampola stream and Rio Cerezzola basins. Well visible also from the plain, M. Barazzone and M.Pulca arise above 700 m. Some little valleys, probably residual of ancient valley furrows, divided the cols.
The cols have a steep and woody look, while the fresh and level intermediate valleys keep cultivation and medieval origin settlement, when the closeness to Canossa fortress favoured without doubts the colonists settlement in the religious and feudal wide properties.
The western landscape is totally different: M. Barazzone dominates a long clayey ridge, which is lower, from 500 to 600 m, and divided Tassobbio and Rio Cerezzola valleys, sloping down toward the first amphitheatre with calanques and hillocks. On the latter ones the most important historical settlements arise: the church of Pianzo and the village of Montale.
Instead on the left bank of Tassobbio lays, isolated between wide clayey valleys, the upland of Leguigno, with rounded summit and in greater part cultivated and inhabited, which is constituted by a centre of Cretaceous period "flyisch".
The upland borders slope down toward Tassobbio and Rio di Leguigno valleys, with clayey castings, partly cultivated, partly constituted by wonderful calanques, one of the wider and more interesting in Reggio Emila's hill.
The area of Leguigno bounded by the less wide one of Beleo on the South, and east of Beleo there is the Tassobbio stream, which goes down from the sources next to Marola, carves a little valley bounded by the panoramic crest between Migliara and Busanella on the West and it is constituted by "marls of Antognola" and "sandstones of Ranzano", coeval, but more tender than Bismantova forming which shapes the near upland of Marola.
The structure of communication over the centuries always developed on the uplands and along the crests, where there were the villages, the churches, the fields, while the valley floor of Tassobbio and of its affluents, deeply carved in clayey ground and subject to very frequent landslides, were avoided or crossed in few points by muletracks of connection between several communities.
Watermills were built up level with the principal fords, they needed water in great quantity. As from those, soon inhabitated all year round, also the deforestation and the cultivation of wide valley floor tracts, generally more open and exposed to the sun, started.
Daniele Canossini, 1995.