Mallos de Aguero is a nature preserve near the village of Aguero in Huesca province. The area is known for towering rock formations that rise above the valley floor, creating a distinctive landscape visible for kilometres. Most of the reserve is open to walkers and climbers at no charge. Hiking trails range from nearly level sections suitable for casual visitors to steep climbs with challenging terrain. Two caves are accessible: one has an easy entrance, whilst the other requires scrambling up a steep, loose slope.
Mallos de Aguero
Two caves punctuate the formation—one straightforward to explore, the other a technical scramble up unstable scree.
- Entrance
- Free.
- Parking
- Parking is available within 270 metres and 400 metres of the main reserve area. No charge mentioned.
- Difficulty
- Trails include nearly level sections and steep climbs with loose rock. The second cave approach is steep and exposed, suitable only for experienced hikers.
- Hours
- Open 24 hours, seven days a week.
What makes it special
The Mallos attract diverse birdlife, particularly bearded vultures, griffon vultures and black kites that nest in and around the rock towers. Climbers scale the formations throughout the season, offering visible routes along the rock faces. A network of long-distance hiking trails winds through the region, many with signposted sections. Two caves provide underground exploration—the easier one suits casual visitors, whilst the second demands technical scrambling skills.
Good to know
- Free entry year-round. No tickets or booking needed; open 24 hours.
- Trails vary widely in difficulty. Some sections are nearly level; others climb steeply with loose rock underfoot. Choose according to fitness and experience.
- The second cave demands scrambling skills. Its entrance is a steep, unstable slope unsuitable for casual hikers or those with limited mobility.
- Parking within walking distance. Car parks are 270–400 metres from the main access area.
Getting there
Parking exists within 270 metres of the main reserve area, with a second car park 400 metres away. From the parking, access to trails and the caves requires walking uphill on marked paths. The terrain is uneven and can be muddy after rain.
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Mallos de Aguero on the map
The approach to the second cave involves climbing a steep, loose slope prone to rockfall and shifting scree. Loose footing and steep terrain can lead to falls; do not attempt without proper footwear and experience.
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Frequently asked questions
Is there an entrance fee?
No. Mallos de Aguero is free to access.How difficult are the walking trails?
Trails range from nearly level sections suitable for casual walkers to steep climbs requiring fitness and sure-footedness. Choose your route based on experience and ability.Can I visit the caves?
Yes. One cave is easy to reach; the other requires scrambling up a steep, unstable slope and is suitable only for experienced hikers.What wildlife can I see?
Birdwatchers see bearded vultures, griffon vultures and black kites nesting in the rock towers. Climbers are visible on the formations during the season.