The Geological Secret of Sant Joan les Fonts: The Basalt Flows

In the heart of La Garrotxa, along the stretch known as Molí Fondo, the earth unfolds one of its most fascinating mysteries: the basalt flows of Sant Joan les Fonts. This unique and astonishing place showcases three lava flows from different eruptive sources that descended consecutively along this stretch of the river, overlaying each other and creating unique morphologies due to the cooling of the lava into columns and slabs.

These imposing rock formations are an open book to the volcanic past of la Garrotxa. Each layer of basalt reveals a different chapter, an eruption, a moment of transformation that has shaped the landscape we admire today.

A circular discovery route through this area allows us to plan a geological excursion in a unique setting; moreover, it is signposted and has moderate difficulty. Exploring the basalt flows means discovering not only the geological wonders of la Garrotxa but also connecting with the volcanic past that remains palpable in every stone, every stream, and every panoramic view of the natural park surrounding this place.

Admire this landscape, where the lava from volcanoes has turned into stone; a spectacle forged through millennia for you to enjoy today. Come and let the secrets of the earth inspire you: walking among these rock formations, you will feel the creative force of nature beneath your feet!