Length: 5.6 km,
Altitude difference: 170 m,
Cumulative difference: 170 m

A semi-demanding biking trail that leads past the source of the Soča River to the valley of Zadnja Trenta.

The tour starts at the turn-off for Izvir Soče on the Trenta - Vršič road.
Following the asphalt road, one reaches Koča pri Izviru Soče (Lodge at the source of the Soča River) after 1.3 km.
Here the macadam road begins and takes one past the isolated homesteads of typical Trenta-like architecture to a parking lot.
The end of this biking trail can be yet another starting point for a mountaineering experience (climbing Jalovec), while before reaching the end of this biking trail one can take a short hiking tour to the source of the Soča River, which starts at Koča pri Izviru Soče.