Monumento Natural Dobramento Xeolóxico de Campodola-Leixazós

Dobramento Xeolóxico de Campodola-Leixazós (the Campodola-Leixazós Geological Fold) is a protected natural monument in the municipality of Quiroga, in the province of Lugo, Galicia, Spain. It is a massive rock fold, hundreds of millions of years old, exposed at the surface thanks to the slow, patient work of the Ferreiriño river cutting into the mountainside over millennia.

What makes this place special?

This is considered one of the largest and best-preserved geological folds on the Iberian Peninsula, and by some accounts one of the few places on Earth where a fold of this scale can be observed directly on the surface. The structure covers an area of roughly 90 hectares, stretching between the villages of Campodola (in the parish of O Hospital) and Leixazós (Pacios da Serra), with the associated stretch of the Ferreiriño river valley running for approximately 21 kilometers.

How did it form?

The fold took shape during the Carboniferous period, between 324 and 305 million years ago, as a result of the collision of two continental landmasses during the Hercynian (Variscan) orogeny — the mountain-building process that eventually led to the formation of the supercontinent Pangea. Enormous tectonic forces bent rock layers that were originally horizontal into a recumbent fold tilted toward the north, with limbs (flanks) extending between 10 and 12 kilometers. The central portion of the fold has remained almost intact since the first phase of Variscan deformation, preserving its original subhorizontal orientation.

Why is it visible at the surface?

Geological folds of this magnitude are usually buried deep underground, hidden from view. At Campodola-Leixazós, the Ferreiriño river carved its channel through the mountainside over millions of years, stripping away the rock layers that once covered the fold and exposing its cross-section. This natural "cut" allows geologists and visitors alike to study the shape of the fold directly on the rock surface, without any need for excavation or drilling.

Protected status

The formation was officially declared a natural monument through Decree 120/2012, issued by the Galician regional government on April 26, 2012. It lies within the "Ancares-Courel" Special Area of Conservation, and in 2019 it was incorporated into the Courel Mountains Geopark, a UNESCO-recognized area celebrated for its exceptional geological value.

Frequently asked questions

Where exactly is this natural monument located? It is located in the municipality of Quiroga, in the province of Lugo, Galicia, between the villages of Campodola and Leixazós, with part of the area extending into the neighboring municipality of Folgoso do Courel.

How old are the rocks that form this fold? The rocks date back to the Carboniferous period, and the folding process itself occurred between 324 and 305 million years ago, during the Hercynian orogeny.

Can the site be visited independently? Yes, the area is accessible as part of hiking and sightseeing routes within the Courel Mountains Geopark, though as with any protected natural area, it is worth checking local signage and access rules beforehand.

Why is this site considered so unique? Because of the sheer size of the exposed fold, how well its original structure has been preserved, and how easily visitors can observe a geological process from hundreds of millions of years ago with the naked eye, without any specialized equipment.

What is its connection to the Courel Geopark? The fold is one of the key geological landmarks of the Courel Mountains Geopark, part of a UNESCO-recognized network of areas valued for their significance to earth sciences, education, and sustainable tourism.