The upper valley is somewhat influenced by the sea air keeping it free of fog and strong winds, and therefore relatively pleasant even during the winter months.
In this valley there are 79 fortifications (castles, fortified towers and dwellings, etc.)
The main villages along this river are: Ferriere, Bosconure, Cantoniera, Farini d'Olmo, Bettola, Ponte dell'Olio, Vigolzone, Grazzano Visconti, Podenzano.
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