Distance: 5,69 km
Elevation gain: 87 m
Visit the route track in Wikiloc.
La Crosa is an exceptional volcanic building within the Catalan volcanic field. The violence of its explosions, due to the interaction of magma with groundwater, opened a large crater 1,250 meters in diameter, built below the original level of the terrain. These dimensions make it the largest in the Iberian Peninsula and one of the largest in Western Europe. Although there is no precise dating, there is no doubt that the eruption of the Crosa is quite recent, of a few tens of thousands of years at most.
The itinerary starts after kilometre 9 of the GI-533 road from Girona to Santa Coloma de Farners, at the car park of the Guilloteres area. Right at the parking there is an informative ceiling. Next to it there are a wooden fences that allow access to an excavation of the old quarry of the Guilloteres, as well as a viewpoint with very good views over the crater and over the Gironès and the Selva.
To start the route, you have to go back to the parking lot. We cross the road through a basement pass, and at 100 meters, we turn the first road to the left starting the descent. We follow the flags that take us inside the crater. After a while, we turn back to the left, following the banners that carry us inside the crater. At the end of a steep descent we take the path to the right, without leaving the road signposted inside the crater. All the descent allows us to enjoy the leafy holm oaks typical of all the volcanic relays of the region.
At the bottom of the crater we find an informative plaphon that explains the desiccation of the ancient wetlands inside. We continue for the left skirting a field of walnut trees. At the end of the field, a little to the right, hides the mine, just where a drainage ditch from the fields gets underground.
We continue the itinerary through the crater. The same path, after turning slightly to the left of a small forest, will take us to the central point of the crater, next to a large pile of volcanic stones. In front of us, we can appreciate the small horseshoe-shaped secondary crater. This strombolian-type crater formed when explosive activity by evaporation of groundwater ceased. Around it, the volcanic rocks are reddish, as seen on the same path, and sometimes with very curious shapes.
A slightly climb takes us to a small esplanade with a new informative board and good views over the crater. At this point we take the path on the left, gradually climbing up to the top of the crater, to the views of the road. At this point we have to turn left, following the flags that lead us to the Guilloteres. While following these flags, you get a stretch in the middle of holm oak forests parallel to the road, until we find the way down to the crater, which we have to follow to return to its starting point.