The Marmitte dei Giganti: Fossombrone’s Hidden Canyon

Tucked away in the hills of Fossombrone, along the ancient Via Flaminia and deep in the Metauro Valley, the Marmitte dei Giganti stand out as one of the Marche region’s most fascinating geological wonders. Also known as the Forra di San Lazzaro, this striking canyon is the result of a slow, powerful process that took place over thousands of years: swirling currents, loaded with sand and pebbles, gradually carved deep cylindrical basins and narrow gorges into the limestone rock.

The canyon stretches for about 500 metres, with rock walls soaring up to 30 metres high and narrowing at points to just 1.5 metres across—widening in others to around 13. Scattered along the riverbed are the namesake “marmitte” (literally, “potholes”): perfectly rounded basins that can measure over 5 metres in diameter and plunge as deep as 4 or 5 metres. The contrast between the smooth rock faces, crystal-clear water, and wild greenery clinging to the cliffs creates a visual scene so striking it feels sculpted by an artist’s hand.

Nature’s spectacle is made even more intriguing by local legend: according to folklore, these massive “cauldrons” were once used by giants to cook wild boar stew. A playful tale that adds a touch of mystery to a place already full of wonder.

The perfect starting point for exploring the Marmitte is the Ponte dei Saltelli, also known as the Ponte di Diocleziano, which offers a sweeping panoramic view of the gorge. From here, a path winds down to the base of the canyon, where you can get up close to the spectacular rock formations and the crystal-clear waters of the Metauro River.

If you’ve brought a packed lunch, take a break by the river—some local cheeses and a glass of regional wine will make the moment even more memorable. Spring and autumn are the best seasons to visit, when the weather is mild and the landscape comes alive with rich, vibrant colours. The ideal time of day is in the morning, when the light hits the canyon just right—perfect for photos without the sun in your lens. Wear comfortable trekking shoes and bring a water bottle: the walk down to the river offers a fresh perspective that’s absolutely worth the effort.

For an even more immersive experience, join a guided canoe or kayak tour along the Metauro River. These excursions let you explore the canyon from a whole new perspective—gliding between towering rock walls, discovering hidden corners, and soaking in the raw beauty of this untouched landscape. Organized by local operators and suitable even for beginners, it’s an exciting and memorable way to connect with the wild side of the Marche region. Bring water shoes, a waterproof bag for your personal belongings, a towel, swimsuit, a full change of clothes, and—most importantly—a spirit of adventure.

After your adventure at the Marmitte, take some time to explore Fossombrone — a small gem nestled among rolling hills and steeped in history. Strolling along Corso Garibaldi, with its elegant arcades and charming local shops, you’ll soak in the authentic atmosphere of a town where time moves slowly and Renaissance details still shape the landscape. Don’t miss the chance to visit the Corte Alta, once the residence of the Dukes of Urbino, and the Archaeological Park of Forum Sempronii, home to the ruins of the ancient Roman settlement.

To round out the experience, let the local flavours guide you. In the historic centre, you’ll find traditional osterias and restaurants serving regional dishes like passatelli in brodo, crescia sfogliata with local cured meats, and the rich, layered vincisgrassi alla marchigiana. Pair your meal with a glass of Bianchello del Metauro, the area’s signature DOC white wine—fresh, aromatic, and just right after a day outdoors. And for a sweet finish, try bostrengo, an old country-style dessert made with stale bread, dried fruit, and cooked must: a true taste of Marche tradition.