The first climbing stage. The maximum altitude of the entire Tirreno-Adriatico EOLO is reached on Stage 4 at the Rifugio Perugia GPM, at 1521m. The first part of the stage is almost flat, with undulations and gentle slopes. After Castelsantangelo sul Nera, the very demanding section of the Sibillini Mountains begins. The route climbs up the Forca di Gualdo which leads to the plain of Castelluccio. Wide roads, continually climbing, lead to the ascent to the Rifugio Perugia (the building is located just after the top) and then the descent to the outskirts of Norcia to face the last stretch of Ospedaletto. In the final kilometers it’s initially downhill to the town of Cascia where the road climbs up on a gentle slope.