The environment is completely wild as far as Gajum, and is made up of coppices; the quality of its waters is demonstrated by the presence of stream trout, sometimes also visible under the town bridges in Canzo. The view of the river valley is dominated by the promontory named "Cepp da l'Angua" or "Scalfìn dal diaul", in the shape of an enormous heel, while on the right side you can see, although covered by vegetation, the terraces of the moraines, where "Prim Alp", "Segunt Alp" and "Terz Alp" are built. A geological nature trail traces the valley, whose attractions are the green rocks ("massi erratici") of "serpentite" and "serizz". After passing the town, the River Ravella flows through the plain of Lambro, and in the frazione of Castelmarte, also called Ravella, it flows into the Lambro River.