The Amber Trail runs along the entire perimeter of theRontagnano Nature Oasis, is 6.8 km long and has an elevation gain of 358 meters. The area is rich in gorse, hawthorn, oak and chestnut trees. Hedgehogs, porcupines and badgers can be encountered in the woods.

Start from Rontagnano (cemetery parking area) by heading toward trail 123, soon reaching a cut-off that eventually allows you to shorten the walk (trail 123d). The main trail 123 leads to Campaolo, a locality known for the discovery by a farmer of one of the largest ambers in Europe. This precious 625-gram amber ovoid is preserved along with many other archaeological and mineralogical finds in the “Veggiani Collection.” The path curves to the southwest, still around the nature oasis; in particular, a detour leads to a place where it is possible to admire, in a natural stone reservoir, specimens of Newts (Triturus carnifex): these are amphibians similar to salamanders that live in still waters characterized by the absence of fish and pollution. Taking the last stretch of the trail, we arrive at the village of Rontagnano, located on the top of a hill between the Uso and Savio valleys. Once there stood a Malatesta castle (12th century) of which some ruins still remain. The keep of the fortress was transformed into a bell tower in the 18th century. The nearby Church of San Biagio preserves some interesting furnishings, including a 15th-century wooden kneeler and an 18th-century organ. The entire route is completed on foot in about 2h 30m.