From Tuscany to Umbria, riders face today the first long stage of the season: there are indeed 239 kilometers connecting Follonica to Colfiorito. A very long stage, the third of Tirreno-Adriatico, and quite undulating in the first part: after the start from Follonica, riders will cross the northern part of Grosseto province near Monte Amiata and traverse the Sienese area by climbing Lume Spento Pass and Foce up to Montalcino and Chiusi.

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Immediately after, the route becomes gentler and crosses the long Trasimeno plain leading to Foligno through predominantly straight roads sometimes with narrow carriageways. After passing Foligno, riders will tackle the final climb to Colfiorito Pass located about 4 km from the finish. The steepest part of the climb is right at the beginning with sections over 10%, followed by a long false flat that rises to the Pass. From here, a short descent and after crossing Colfiorito's town, another brief ascent leads to the finish line.