11
riders
3
rides
Gravel biking around Arratzu offers diverse terrain within the Urdaibai Biosphere Reserve, characterized by its estuary where the Oka River meets the sea. The region features a mosaic of meadows, ancient oak groves, and narrow valleys shaped by the Golako River. Riders encounter varied elevation changes, from demanding climbs in mountainous areas to scenic paths through traditional farmsteads. This landscape provides a range of surfaces suitable for gravel cycling, blending natural beauty with cultural heritage.
Last updated: July 4, 2026
2
riders
30.3km
02:43
870m
870m
Hard gravel ride. Very good fitness required. Mostly paved surfaces. Suitable for all skill levels.
3
riders
34.9km
02:42
930m
930m
Hard gravel ride. Very good fitness required. Mostly paved surfaces. Suitable for all skill levels.

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6
riders
78.4km
06:12
2,010m
2,010m
Hard gravel ride. Very good fitness required. Mostly paved surfaces. Suitable for all skill levels.
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Recreation of Picasso's famous painting. The original can be seen in Madrid.
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Insane new paved road with beautiful turns and views on the coast. Renown for local bikers but not too busy with cars for us around lunchtime
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Lonely coastal road for cycling with a beautiful beach and bars for a break.
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There are always great views from the street
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A low point on the tour. It was a Sunday and all the restaurants were packed. When I politely expressed my wish to be able to charge the battery in Spanish, we were literally thrown out. Spaniards drive long distances to eat out on Sundays. It has never happened to us that the battery was not allowed to be charged. Of course we would have eaten and drank. The whole place was almost entirely made up of holiday apartments, with the blinds down and totally dead without the lunch guests. No hotel, no guesthouse, but with a train station. Cheers to the Euskotren regional train in the Basque Country, on time, super helpful staff. So take the train back to Gernica!!!
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Completely destroyed by the German Condor Legion in the Spanish Civil War. https://de.wikipedia.org/wiki/Luftkampf_auf_Guernica A well-worth seeing exhibition in the central square shows the horrors of the civil war. The Spanish spelling with "ue" probably goes back to Picasso.
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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.
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Wall reproduction of Picasso's painting "Guernica" exhibited at the Reina Sofía Museum in Paris.
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Gravel biking trails around Arratzu are generally considered difficult. The routes often feature varied elevation changes, including demanding climbs and descents, making them suitable for experienced riders seeking a challenge. For example, the Guernica Mural in Gernika – Artzubi Bridge loop from Gernika covers 18.9 miles (30.4 km) with significant elevation gain.
The terrain around Arratzu is diverse, ranging from open fields and lush meadows to dense native forests and narrow river valleys. You'll encounter a mix of surfaces suitable for gravel cycling, with significant elevation changes. Routes like the Ondarroa Bay – Puerto de Morga loop from Olabekorta, for instance, involve over 2,400 meters of ascent and descent over its 70.6 miles (113.6 km).
Yes, several gravel bike routes around Arratzu are designed as loops. A notable example is the Lekeitio Old Town and Basilica – Ondarroa Bay loop from Amoroto, which offers a comprehensive experience of coastal views and historical towns over 46.9 miles (75.6 km).
Gravel bike trails in Arratzu offer a rich blend of natural beauty and historical sites. You can explore the ancient Monastery of Santa María de Zenarruza, cross the historic Artzubi Bridge, or visit the unique Guernica Mural in Gernika. Many routes also provide stunning Views over the Urdaibai marsh, and some pass through the enchanting Oma Forest.
The gravel biking routes directly around Arratzu, as featured in this guide, are generally rated as difficult due to significant elevation changes and longer distances. While the region offers
The Urdaibai Biosphere Reserve, where Arratzu is located, offers pleasant conditions for gravel biking during spring and autumn. These seasons typically provide milder temperatures and lush landscapes, making for a more comfortable and scenic ride. Summer can also be enjoyable, but be prepared for warmer weather.
Yes, parking is generally available in and around Arratzu, particularly in the village centers or near popular trailheads. Many routes start from towns like Gernika or Amoroto, which offer parking facilities. It's advisable to check specific starting points for detailed parking information.
Public transport options to Arratzu and the wider Busturialdea area exist, including bus services. However, policies regarding carrying bikes on public transport can vary. It's recommended to check with local transport providers for their specific regulations on bikes before planning your journey.
Generally, no specific permits are required for gravel biking on established trails within the Urdaibai Biosphere Reserve. However, as it is a protected area, riders are expected to respect local regulations, stay on marked paths, and minimize their environmental impact to preserve its natural beauty.
The gravel biking experience around Arratzu is highly rated by the komoot community, with an average score of 5.0 stars. Riders frequently praise the diverse landscapes, the blend of challenging ascents with panoramic views, and the opportunity to explore ancient oak groves and historical sites within the Urdaibai Biosphere Reserve.
While the trails themselves might be remote, the routes often pass through or near small towns and villages like Arratzu, Gernika, or Lekeitio. These locations typically offer cafes, bars, and restaurants where you can stop for refreshments and a meal. Planning your route with these stops in mind is recommended.


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