Impressive rock formations less than 2 hours from Zaragoza, a climber's paradise
The Mallos de Riglos are spectacular red conglomerate rock formations rising dramatically from the Gállego River valley, located just over an hour from Zaragoza and offering some of the most breathtaking scenery in all of Aragón. These towering monoliths, with names like El Pisón, La Peña, and El Cuchillo, have been sculpted by erosion over 35 million years and stand as silent sentinels over the Huescan countryside.
The Mallos de Riglos are composed of conglomerate rock — a natural concrete of rounded pebbles and boulders bound together by calcium carbonate. During the Oligocene period, some 35 million years ago, rivers carrying debris from the rising Pyrenees deposited vast alluvial fans across what is now the Huesca province. Over time, these sediments were compressed into rock, and subsequent uplift of the land caused the Gállego River to cut downward through the deposit, leaving the harder conglomerate standing as vertical cliffs while the softer surrounding materials eroded away.
The result is a collection of colossal pillars that change colour throughout the day — from deep burgundy at sunrise to fiery orange at sunset. The tallest of them, El Pisón, rises 300 metres from the valley floor. On clear days, the view from the summit stretches from the Pyrenean peaks to the plains of the Monegros.
For rock climbers, the Mallos de Riglos are a bucket-list destination. The conglomerate rock offers unique climbing challenges: the surface is textured with embedded pebbles that provide excellent friction, but the routes require good technique and a head for heights. Over 200 bolted routes exist on the various faces, ranging from grade 4 (moderate) to grade 8+ (extremely difficult).
The most famous route is the Vía Alicia on the face of El Pisón, a 300-metre multi-pitch climb that is considered a classic of Spanish mountaineering. For beginners, several adventure companies offer guided climbs with top-rope setups on the lower sections. The climbing season runs from March to October, with spring and autumn offering the best conditions.
If climbing is not your thing, the Mallos de Riglos are equally rewarding to explore on foot. The main viewpoint (Mirador de los Mallos) is accessible by car and offers a stunning panoramic view of the entire formation. From there, a well-marked circular trail of about 5 km takes you around the base of the monoliths, passing through Mediterranean forest, past ancient dry-stone walls, and alongside the rushing waters of the Gállego River.
A more ambitious hike leads up to the Ermita de Nuestra Señora de la Blanca, a small hermitage perched on a hillside with a viewpoint that captures the Mallos in their full majesty. The round trip takes about two hours and is suitable for most fitness levels. Bring water, especially in summer, as there is no shade on the upper sections.
The Mallos de Riglos are a haven for birdlife. Griffon vultures nest on the higher ledges, and you will almost certainly see them circling on thermals above the cliffs. Peregrine falcons, golden eagles, and Alpine swifts also inhabit the area. For photographers, the golden hour light on the red rock is magical, and the contrast with the green riverbank vegetation creates stunning compositions. A telephoto lens will reward you with intimate vulture portraits.
The Mallos de Riglos sit in the heart of a region packed with attractions. On your way from Zaragoza, you can stop at the Remolinos Salt Mines for a fascinating underground tour. If you are feeling adventurous, the bungee jumping at nearby Murillo de Gállego offers a 40-metre free fall from an 18th-century bridge. For families, the Dinópolis theme park in Teruel can be combined into a longer weekend itinerary.
Location: Riglos, Huesca province — 110 km from Zaragoza (1 h 15 min via A-132)
Best time to visit: Spring and autumn for hiking; all year for photography
Access: Free. The main viewpoint and trailhead have adequate parking.
Difficulty: Easy (viewpoint) to challenging (climbing routes)
Facilities: Bar-restaurant in Riglos village; picnic area at the foot of the Mallos
Dog-friendly: Yes, on leash. Keep your dog away from cliff edges.
The Mallos de Riglos are located approximately 110 km north of Zaragoza, about a 1 hour 15 minute drive via the A-132 motorway. The road follows the Gállego River valley and offers scenic views from the moment you leave the city.
Not at all. While the Mallos are a world-renowned climbing destination, there are excellent walking trails and viewpoints that allow everyone to appreciate these spectacular formations. The main viewpoint at the foot of the rocks offers an unbeatable panorama, and several circular hiking routes wind through the surrounding countryside.
Spring (April–June) and autumn (September–October) are ideal, with mild temperatures and the landscape at its most vibrant. Summer can be very hot for hiking, though early mornings remain pleasant. Winter visits are possible but the rocks can be cold and the days short.
Yes, several adventure companies in the Huesca province offer guided climbing experiences at the Mallos de Riglos for all skill levels. Courses range from introductory sessions for beginners to multi-pitch ascents for experienced climbers. Equipment rental is usually included.
The Mallos de Riglos are conglomerate rock formations, composed of rounded pebbles and boulders cemented together by calcium carbonate. They were formed over 35 million years ago during the Oligocene period, when sediments from the emerging Pyrenees were deposited and later eroded by the Gállego River into their current dramatic shapes.
For the best combination of comfort and convenience, base yourself in Zaragoza city centre. Maestro Luna offers a welcoming two-bedroom apartment with all amenities, just steps from the city's top restaurants and cultural sites. Las Armas provides a modern, spacious alternative near the Ebro river. Both make getting to the Mallos de Riglos straightforward — simply take the A-132 north and follow the signs to Riglos.
Make Zaragoza your base. Our boutique apartments are just minutes from all attractions.
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