Earth mushrooms (erosion pyramids) of Rezzago

Caslino d'Erba to Erosion Pyramids of Rezzago and Asso

The Geological Wonders and Enco Chestnut Groves

This unique excursion offers considerable geological and naturalistic interest through the lush woods of the Lariano Triangle in search of autumn chestnuts, massive erratic boulders, and the famous earth mushrooms of Rezzago. These natural earth mushrooms (also known as erosion pyramids) are fascinating pillars of glacial moraine material (gravel and clay) topped by a large protective stone that compacts the column and shields the underside from rainwater erosion. The route crosses through the beautiful Selva Castanile di Enco at 840 m (2,756 ft), a stunning, historic chestnut grove where in autumn it is possible to collect chestnuts in strict compliance with local municipal provisions. We highly recommend using the regional FNM railway stations of Caslino d'Erba and Asso Canzo to conveniently access this beautiful point-to-point walk, and hikers should remember to bring a reliable supply of water, packed food, and sturdy hiking shoes.

From Caslino d'Erba past the Boldrino Cave to the Enco Valley

Starting from the station of Caslino d'Erba, we cross the provincial road and begin to climb between the traditional houses of the village, skirting past the town hall and walking along Via Monte Palanzone right next to the Piot stream. After crossing the historic Vallunga bridge, we arrive at the beautiful open-air Franciscan Forum, where you can admire valuable votive shrines dedicated to the life and works of St. Francis of Assisi. At the forum, we follow the trail on the right that leads directly into the forest, passing the large cross that overlooks the religious complex to shortly reach the historic Boldrino cave at 750 m (2,461 ft). Following a gentle climb halfway up the hillside and navigating across two deep valleys, we arrive at the beautiful clearing of Pian di Cupiàna at 900 m (2,953 ft). Upon reaching the Bocchetta di Vallunga pass at 905 m (2,969 ft), we turn right to begin our descent toward the Enco meadows.

Discovering the Earth Pyramids and descending to Asso Station

As the dirt path transitions into a paved lane, we officially enter the Selva di Enco, arguably the most beautiful and well-maintained chestnut forest in the entire Lariano Triangle. At the end of the descent, we take a right turn and, after just a few steps, look for the trail sign pointing to a left detour to reach mushroom no. 1; following this itinerary with caution, you will have the opportunity to see two fully formed pyramids and a third one currently in its embryonic stage. We then continue our descent to the historic church of the Buona Morte at 610 m (2,001 ft), where a massive erratic boulder sits next to a well-equipped shaded rest area. Once we reach the Rezzago bridge, we turn right to climb up a steep paved ramp, and after traveling along a mostly flat stretch of gently rolling terrain, we begin our final descent toward Asso. At the bridge over the Lambro river, we turn right following Via Lazzareto, and upon reaching the traditional church of Saints Giovanni & Paolo (Sts. John and Paul), we continue straight to wrap up the journey at the Asso-Canzo railway station.