Castellfollit de la Roca is built on a basalt crag that is nearly 1 kilometer long but less than 50 meters wide at its narrowest point.
The basalt cliff face was created by the erosion of two consecutive lava flows dated to approximately 217,000 and 192,000 years ago.
The village is situated within the Garrotxa Volcanic Zone Natural Park, which contains over 40 volcanic cones and 20 lava flows.
The distinctive vertical columnar jointing in the basalt is a result of the rapid cooling and contraction of the lava flows against the riverbed.
The Passarel·la - Mirador de Castellfollit de la Roca offers a panoramic perspective of one of the smallest municipalities in Spain, which is built entirely atop a basalt cliff. The cliff itself rises over 50 meters above the Fluvià and Toronell rivers. It was formed by two overlapping lava flows from extinct volcanoes in the Garrotxa Volcanic Zone. The viewpoint provides an unobstructed view of the historic medieval village houses constructed from volcanic rock. This vantage point is a key stop for observing the geological stratification of the cliff face.
The central section of the pedestrian walkway provides the clearest line of sight to the village houses hanging over the precipice.
Visit the church of Sant Salvador at the edge of the cliff after viewing the panorama to see the rock structure from a different angle.
Wear stable, non-slip footwear as the area surrounding the viewpoint features uneven volcanic stone paths.
Carry a light windbreaker as the river valley corridor can create significant localized breezes.
Do not attempt to climb or scramble down the cliff face from the viewpoint, as the volcanic rock is prone to erosion and instability.
