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OSA San Tomaso Snack Bar – Taja Sass Boulders loop from Valmadrera

Routes

Hiking trails & Routes

OSA San Tomaso Snack Bar – Taja Sass Boulders loop from Valmadrera

Moderate

4.5

(35)

213

hikers

OSA San Tomaso Snack Bar – Taja Sass Boulders loop from Valmadrera

03:02

8.77km

410m

Hiking

Moderate hike. Good fitness required. Mostly accessible paths. Sure-footedness required. The starting point of the route is right next to a parking lot.

Last updated: May 16, 2026

Waypoints

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Parking

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1.89 km

Ferrata Corno Rat Trailhead

Highlight • Trail

Reachable a few minutes from Valmadrera, it allows you to quickly reach (1 hour) the via ferrata 30 ° OSA al Corno Rat

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1.91 km

Medieval Stone Path with Waterfall

Highlight • Trail

Simple and easily accessible paths

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2.17 km

Cappella Vars

Highlight • Religious Site

Crossing point for the 30 ° OSA via ferrata at Corno Rat

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3.56 km

Agriturismo Rusconi, Località San Tomaso

Highlight • Restaurant

3.65 km

OSA San Tomaso Snack Bar

Highlight • Mountain Hut

It's a beautiful place to sunbathe and there's also a refreshment point

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4.44 km

The Valmadreresi of today usually call the ancient area "Molinata" Taja Sass, located a few steps from the farms of S. Tomaso. The name derives from the fact that an immense erratic boulder ("sass") of greenfinch from the Valmalenco was cut for industrial purposes by a marble company.

The quarry operated from the last decades of the 19th century until 1920. The large blocks of serpentine that came out of it were then converted into steps, window sills and funerary monuments. The large cut blocks (the last of which we don't know why, were left on site) were brought to the town and sent to the Marcila factory by ox-drawn carts.

The cut was made by inserting wooden wedges into holes drilled along a line of weakness skilfully identified on the rock. The wedges were wet at regular intervals and the wood, expanding, caused the fracture of the line of weakness allowing the detachment of a block, which then had to be further broken and worked or transported downstream. The signs of this process are still visible in the Massi della Molinata, which you meet along the Sentiero delle Vasche.

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