3.9
(5)
48
riders
4
rides
Gravel biking around Agüero offers routes through the pre-Pyrenean mountains of Huesca, Aragon, characterized by dramatic natural landscapes. The region features spectacular reddish rock formations, such as the Mallos de Agüero and Mallos de Riglos, which rise hundreds of meters high. The terrain includes expansive plains, rolling hills, and forests, with unpaved tracks suitable for gravel cycling. This diverse environment provides varied routes away from traffic, traversing agricultural land and natural settings.
Last updated: July 11, 2026
3.7
(3)
18
riders
36.8km
03:06
870m
860m
Hard gravel ride. Very good fitness required. Mostly paved surfaces. Suitable for all skill levels.
5.0
(1)
9
riders
96.8km
08:50
1,940m
1,940m
Hard gravel ride. Very good fitness required. Mostly paved surfaces. Suitable for all skill levels.

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7
riders
142km
11:32
2,760m
2,760m
Hard gravel ride. Very good fitness required. You may need to push your bike for some segments of this route.
3.0
(1)
4
riders
51.8km
04:43
950m
950m
Hard gravel ride. Very good fitness required. Mostly paved surfaces. Suitable for all skill levels.
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In 2021, Castillo de Loarre was named the most beautiful castle in Spain. It is a magnificent Romanesque castle, the oldest parts of which date back to the early 11th century. This makes it one of the oldest surviving castles in Spain.
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You must walk around the alleys of Agüero, and there is a magnificent view of the Mallos de Agüero.
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The Donjon has no fewer than 5 floors and can be admired in several films.
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The Castle of Loarre is a monastic fortress built from the year 1019. The castle is considered one of the most beautiful in Spain and has enjoyed heritage protection since 1906.
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The impressive remains are located approximately 250 metres north of the Marcuello castle.
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Narrow and natural gorge.
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The city is home to artistic treasures such as the Romanesque Church of El Salvador and the 12th-century Church of Santiago. The latter, located one kilometer from the city, has been declared a National Monument and is one of the most beautiful Romanesque temples in Aragon.
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The castle contains elements of Romanesque architecture and has Bien de Interés Cultural status, which indicates its importance to the Spanish architectural heritage.
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You can explore 4 dedicated traffic-free gravel bike trails around Agüero, offering diverse routes through the pre-Pyrenean landscape.
The trails around Agüero feature a varied topography, combining agricultural land, thick forests, rolling hills, and unpaved tracks. You'll navigate paths away from traffic, often with views of the dramatic Mallos rock formations and the Gállego River.
Yes, the routes in this guide are generally considered difficult due to significant elevation gains and distances. For instance, the Mallos de Riglos – Peñas de Riglos loop from Agüero covers over 140 km with nearly 2800 meters of elevation gain, providing a substantial challenge.
Many routes offer stunning views of the iconic Mallos de Agüero and the towering Peñas de Riglos. You might also pass by the Camino del Cielo - Panoramic View, offering impressive vistas of the plain and the Gállego River.
Yes, the region is rich in history. You can find routes that pass near historical landmarks such as Marcuello Castle or the Loarre Castle – Peñas de Riglos loop from Riglos, which includes the impressive Loarre Castle.
Spring and autumn generally offer the most pleasant weather for gravel biking in Agüero, with milder temperatures and less tourist traffic compared to peak summer months. This allows for a more serene experience on the trails.
While the routes listed in this guide are rated as 'difficult' due to their length and elevation, the 'no traffic' nature of the trails means a safer environment. Families with experienced teenage riders might enjoy some sections, but beginners or younger children may find them too demanding. Shorter, less strenuous options might be available locally.
The dramatic rock formations of the Mallos de Riglos are a natural monument and home to numerous vultures, including griffon vultures. Keep an eye on the skies, especially around the Riglos Griffon Vulture Viewing Area, for a chance to spot these magnificent birds.
All the traffic-free gravel bike routes featured in this guide are designed as loops, allowing you to start and finish at the same point. For example, the extensive Mallos de Agüero – Pígalo Pools loop from Agüero offers a full circular experience.
Agüero and nearby villages like Riglos typically offer public parking areas suitable for trail access. It's advisable to check local signage upon arrival for specific parking regulations and designated spots near trailheads.
The area is highly rated by the komoot community, with an average score of 4.0 stars. Reviewers often praise the spectacular natural scenery, the challenging yet rewarding terrain, and the tranquility of cycling on paths away from vehicle traffic.


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