From Sigillo walk or drive up to the junction between Val di Ranco and Pian dei Cavalli. When you get to Piano di Porci turn right towards Val di Ranco, then right again on the cart-road leading to the col between Mounts Culumeo and Montarone; you can park on the top, near a big relay station. Go North-East, beyond the wooden fence; when you get to the woods start changing the mountainside (n°10), while walking up to the near rocky ridge (some exposed sections of the trail require particular caution). Leave the wide mule track and trail n°11 on your right; going left uphill, you will meet a brook. Cross it, then, at the end of the valley, take trail n° 10 bis to hike back to the starting point.