A pass that you have to earn sweatily (regardless of which side you come from). The ascent from the west over the Rif. Val di Fumo is long, stony and quite steep. From the east it is a little easier but also steep up an old military path. The Passo San Valentino is the oldest pass between Val Rendena and Val di Fumo and, as is often the case in the Adamello area, remains from the First World War can be found here.