How to drive the steep gravel sector of Monte Sante Marie?
Monte Sante Marie is an unpaved road sector in the Province of Siena, Tuscany, linking Asciano with Castelnuovo Berardenga through the Crete Senesi hills. Famous as the decisive sterrato sector of the Strade Bianche, the 11.5-kilometer route crosses rolling terrain made of white clay and loose gravel.
| Road facts: Monte Sante Marie | |
|---|---|
| Location | Asciano to Castelnuovo Berardenga, Siena, Tuscany (Italy) |
| Length | 11.5 km (7.1 miles) |
| Max Gradient | 18% |
| Surface | Unpaved (White clay and loose gravel) |
Where is the Monte Sante Marie road located?
The unpaved sector runs through the heart of the Crete Senesi region in Tuscany. Starting near Asciano, the 11.5-kilometer dirt road heads north toward Castelnuovo Berardenga, climbing and descending short hills along rural farmland.
What are the driving conditions on the Monte Sante Marie sterrato?
The entire 11.5-kilometer sector is unpaved, consisting of hard-packed soil covered by loose stones and fine white clay dust. The road includes short, steep ramps with gradients reaching up to 18%, tight off-camber turns, and blind crests where loose gravel accumulates on the outer edges of the lane.
What hazards exist on the Monte Sante Marie gravel route?
The main hazard is reduced tire grip on steep 18% slopes, where loose stones cause drive wheels to spin during climbs and lock during braking on descents. Dry weather creates dense dust clouds that obscure visibility when meeting agricultural vehicles or cyclists. When wet, rain turns the white clay into heavy, slick mud that fills tire tread grooves and drastically increases braking distances.