4.7
(54)
605
riders
81
rides
Mountain biking around Arratzu offers a diverse landscape within the Urdaibai Biosphere Reserve, characterized by rolling hills, dense woodlands, and river valleys. The terrain includes both challenging ascents and flowing descents, with routes often traversing through natural parks and past historical sites. The region's geology provides a mix of surfaces, from forest tracks to more technical singletrack.
Last updated: October 5, 2026
5.0
(1)
12
riders
46.8km
04:32
1,590m
1,590m
Hard mountain bike ride. Very good fitness required. Advanced riding skills necessary.
4
riders
19.0km
01:34
460m
470m
This moderate 11.8-mile mountain biking route in the Urdaibai Biosphere Reserve offers lush forests and scenic hills from Ajangiz.

4.8
(5)
53
riders
41.5km
03:52
1,210m
1,210m
Hard mountain bike ride. Very good fitness required. Suitable for all skill levels.
5.0
(1)
29
riders
43.8km
03:49
1,070m
1,070m
Hard mountain bike ride. Very good fitness required. Suitable for all skill levels.
4.0
(4)
25
riders
26.1km
02:11
700m
700m
Moderate mountain bike ride. Good fitness required. Suitable for all skill levels.
Get access to more routes and recommendations from other explorers.
Already have an account?
Our route recommendations are based on thousands of hikes, rides, and runs completed by other people on komoot.
Start today with a free account
Your next adventure awaits.
A visit to the renovated Oma forest is highly recommended. There are 32 marked points on the ground, which even indicate the direction to look to see the visual combinations between the trees.
1
0
The Oma Forest - Omako basoa in Basque - is also known as the painted forest, the enchanted forest or even the Ibarrola Forest. Its most common name - Oma Forest - refers to the district in which it is located, which belongs to the municipality of Kortezubi. This original work of art was created between 1982 and 1985, when the Basque painter and sculptor Agustín Ibarrola used the trunks of trees as a kind of canvas for a total of 47 images. On them he painted animals, geometric figures and people, or just parts of them, such as eyes and lips. In addition, many of the compositions do not consist of a single tree, but must be viewed in the context of several tree trunks. To do this, you must pay attention to the signs on the ground that tell the viewer where to stand in order to enjoy the whole image.
1
0
In 1982, artist Agustín Ibarrola began painting the pine trees in the forest near his homestead with the intention of using the landscape as a canvas to give continuity to his artistic expression. It is at this moment when he decides to break the law of perspective and transgress the three-dimensionality of a white line until it becomes two-dimensional. From then on, he explored the possibilities offered by the arrangement of the forest trees, playing with the different planes of depth and creating artistic sets composed of human figures, curves or straight lines, and circles of intense colors. The ideas and concepts that it develops become more complex and advances in various directions as the painted forest expands. With the help of two students from the Faculty of Fine Arts of the UPV/EHU, he carried out a large part of the work that was open to the public until 2018, at which time the biological cycle of the forest came to an end. Given the importance that the work had acquired, the Provincial Council of Bizkaia began the process of making the Forest last, for which it had from the first moment the support of the artist who had made clear his desire for the forest to survive. In this way and in order to preserve El Bosque de Oma, the Ibarrola work has been moved to a new location, also recovering original artistic ensembles lost due to felling, attacks and natural tree falls. Today we can enjoy El Bosque de Oma more complete and more faithful to the artist's original idea.
1
0
The Forest of Oma is one of the best-known works of the Basque artist Agustín Ibarrola and is an expression of the artistic movement known as Art and Nature, which emerged in the late sixties of the 20th century and whose purpose is to convey artistic work to the natural environment, using the landscape as a framework, support and raw material for the artist. The work, located in the town of Kortezubi (Bizkaia), is made up of several sets of geometric motifs and figures painted on the trunk of radiata pine trees. The use of natural living supports, the play of two-three-dimensionality and the experience of placing the visitor at the center of the work of art through his discovery, as well as the diversity of responses it proposes, make this work a reference of the Art and Nature movement and of Basque Art in particular.
1
0
This Roman necropolis is located very close to the highest point of the Sollube massif. Here they received the ashes of the cremated deceased from a nearby town, between the 1st and 3rd centuries AD. c.
0
0
At 684 meters high, this is the highest peak of the massif that bears its name. It is located on the left bank of the estuary. During the Civil War, the so-called Battle of Sollube took place on its slopes for eight days.
0
0
This bridge is an incredible find in the middle of the forest. It is covered with ivy and in summer it is so green that it is hardly visible. If you go down next to the river you can take some great photos with the water and the bridge. For many years this bridge has had to survive numerous floods. It's amazing that he's still here.
1
0
This little section of the trail has it all. There is a stream crossing, there is a nice climb or descent depending on the direction, there are great views, there are wide parts and narrow sections. It is a very nice trail for mountain biking.
1
0
There are over 70 mountain bike trails available around Arratzu, offering a wide variety of options for different skill levels and preferences.
Yes, Arratzu offers several easy mountain bike trails perfect for beginners. You can find at least 3 routes specifically graded as easy, providing a gentle introduction to the region's beautiful landscapes.
For experienced riders seeking a challenge, Arratzu has over 20 difficult mountain bike trails. One such route is Centro BTT Urdaibai Ruta 8 – Reserva de la Biosfera de Urdaibai, which covers 29.1 miles (46.8 km) with significant elevation changes, exploring the varied terrain of the Urdaibai Biosphere Reserve.
Many of the mountain bike routes around Arratzu are circular, allowing you to start and finish at the same point. An example is the Sollube Summit – Summit of Sollube loop from Gernika, a 22.7 miles (36.5 km) trail that takes you through the scenic hills surrounding Gernika.
The trails often pass through diverse landscapes within the Urdaibai Biosphere Reserve. You can encounter natural monuments like the Oma Forest and enjoy stunning vistas such as the Views over the Urdaibai marsh. Some routes also lead past historical sites and charming villages.
The spring and autumn months generally offer the most pleasant conditions for mountain biking in Arratzu, with mild temperatures and lush scenery. While summer can be warm, the dense woodlands provide some shade. Winters are typically mild but can be wet, so checking the weather forecast is always advisable.
Yes, for those looking for longer rides, Arratzu offers several routes over 20 miles. Beyond the difficult Ruta 8, consider the Artzubi Bridge – Ajangiz Village and Church loop from Gernika, a moderate 29.7 km (18.5 miles) trail that provides a substantial ride through varied terrain.
The mountain bike trails in Arratzu are highly regarded by the komoot community, with an average rating of 4.7 stars from over 30 reviews. Riders often praise the region's diverse landscapes, from rolling hills and dense woodlands to river valleys, and appreciate the mix of challenging ascents and flowing descents.
While specific 'family-friendly' designations aren't always explicit, the easier and moderate routes are generally suitable for families with some biking experience. Look for routes with lower difficulty grades and shorter distances to ensure an enjoyable outing for everyone.
To find less crowded trails, consider exploring routes that are not highlighted as the most popular. While Urdaibai BTT Center Route 2 is a favorite, exploring other moderate trails like the Arrola Oppidum loop from Institutoa, especially during off-peak hours or weekdays, can lead to a more tranquil experience.
Absolutely. Beyond natural beauty, you can cycle to significant cultural sites. For instance, the Old Tree of Gernika (Gernikako Arbola) is a historic natural monument within reach of some routes. You can also find viewpoints like View from San Pedro de Atxarre offering panoramic vistas.


Browse the best MTB trails in other regions.