Scenic tour done counterclockwise, fairly easy technically, it's all dirt roads and easy trails.
Depart Perino for Donceto on asphalt, short descent then dirt road to Pagliara - Vei, continue uphill under Perduca stone.
Pass by Parcellara stone and climb to Bogo mountain, then trail to Caldarola pass.
Continue to Longarini, then dirt road of costa Rasa to Crocetta pass then at the fountain go up into the large forest of pan Perduto which you cross.
Now descend to Pianelli on long dirt road, short climb to Lagobisione then dirt descent to Mezzano Scotti.
3 km asphalt climb then dirt descent to Concesio that ends almost in the riverbed of the Trebbia.
Last km on the path along the river, quite challenging because of the various pebbles but beautiful.
Very scenic area around Pietra Parcellara.
Also before Longarini where you have a nice view of the Valtrebbia and the high mountains in the background.
Water is found at Ca Malosso, it is in the trail