Best natural monuments around Guernica Y Luno are situated within the Urdaibai Biosphere Reserve, a UNESCO-designated area in the Basque Country of Spain. This region is characterized by a river basin that forms extensive marshes, lush forests, and coastal landscapes. The area offers diverse ecosystems and is recognized for its ecological importance and varied natural features.
Last updated: July 1, 2026
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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.
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When the Condor attacked, the residents of Guernica tried to protect the tree with their bodies because it is sacred to the Basques. Even today, elected politicians have to swear their loyalty to the Basque Country at an oak tree that stands a few meters away.
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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.
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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.
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Urdaibai is an extraordinarily beautiful and varied natural space, which is why it was declared a Biosphere Reserve by UNESCO in 1984. Its heart is the Oka River that rises on Mount Oiz and transforms into an estuary upon reaching Mundaka, creating spectacular marshes full of life. We recommend you see them at different times of the day to be able to appreciate both low and high tide. But in addition to unique marshes, Urdaibai offers you some of the most beautiful and appreciated beaches in Euskadi, Laida, which constantly varies in shape and size or the spectacular Laga beach, located under the imposing Peñón de Ogoño, which many define as “the closest thing to paradise.”
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Gernikako Arbola is an oak tree in the Basque city of Gernika.
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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.
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The Artzubi Romanesque bridge was built in the 16th century. Wherever you see it, it has overcome floods and floods from the Golako River, which passes below and flows into the Oka River. In another time there were more bridges like this one, but it is the only one in the area that has endured. https://www.urdailife.com/artzubi-puente-cuento-arratzu-mendata/
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The region offers several unique natural monuments. You can visit the Oma Forest, an 'Art and Nature' installation where trees are painted with geometric motifs. Another notable site is the Artzubi Bridge, a well-preserved 16th-century Romanesque bridge that forms part of the Camino de Santiago itinerary. The entire area is within the Urdaibai Biosphere Reserve, offering diverse landscapes.
The Urdaibai Biosphere Reserve is a UNESCO-designated natural paradise characterized by a river basin that forms extensive marshes with a wide inter-tidal zone. You'll find a mosaic of lush forests, scrublands, moorlands, and coastal landscapes with high cliffs and capes. The dynamic environment of the Urdaibai Marshes, where the Oka and Golako rivers meet, changes constantly with the tides.
Yes, the region is rich in historical natural monuments. The Old Tree of Gernika (Gernikako Arbola) is a significant oak tree with deep historical roots in Basque culture. Additionally, the Santimamiñe Cave, located within the Urdaibai Biosphere Reserve, is an archaeological site from the Magdalenian era, featuring important Paleolithic cave paintings.
Absolutely. The Oma Forest is considered family-friendly, offering a magical experience where art blends with nature. The Views over the Urdaibai marsh are also family-friendly, providing opportunities to observe the changing landscape and birdlife. The Old Tree of Gernika is another accessible historical natural monument suitable for families.
The Urdaibai Biosphere Reserve experiences a temperate ocean climate. While it can be visited year-round, spring and autumn are particularly pleasant for exploring, offering mild temperatures and vibrant natural scenery. These seasons are also excellent for birdwatching in the marshes as many species use it as a stopover or wintering site.
The Oma Forest is located in Kortezubi within the Urdaibai Biosphere Reserve. Admission is free, but booking in advance is required. It's reachable by a pleasant 50-minute walk from Santimamiñe. The original forest paintings were relocated and reproduced in the nearby Basobarri Forest, which opened in 2023.
Yes, there are several excellent viewpoints. The Views over the Urdaibai marsh offer incredible vistas of the dynamic estuary. Additionally, the Peñón de Ogoño, an imposing rock formation, provides panoramic views of the Urdaibai coastline and the Cantabrian Sea.
The area around Guernica y Luno, especially within the Urdaibai Biosphere Reserve, is ideal for various outdoor activities. You can find numerous routes for hiking, cycling, and gravel biking. Activities like canoeing, paddle surfing, and boat trips are also popular ways to explore the estuary.
Yes, there are many hiking opportunities. You can explore trails like 'The emblems of Guernica and Luno - cycling around the Urdaibai Biosphere Reserve' or the 'Urdaibai Bird Center – Agonía de Fuego Sculpture loop'. These routes allow you to experience the diverse landscapes and natural monuments of the region. For more options, check out the hiking guide for Guernica y Luno.
Absolutely. The region offers a variety of routes for both cycling and gravel biking. You can find challenging rides like the 'Montecalvo – circular from Guernica y Luno' for touring bicycles or the 'Mañaria – View Towards La Nevera loop' for gravel biking. Explore more options in the cycling guide and gravel biking guide for Guernica y Luno.
The Santimamiñe Cave is an incredibly significant archaeological site within the Urdaibai Biosphere Reserve. Dating back to the Magdalenian era (13000 B.C.), it houses an important collection of Paleolithic cave paintings, including around 50 figures of animals like bison, horses, and deer. It was recognized as a UNESCO World Heritage Site in 2008, offering a rare glimpse into prehistoric art and human history.
The Urdaibai Marshes are a critical habitat for numerous bird species, serving as both a nesting ground and a stopover or wintering site for many, including scarce birds like fish eagles and spoonbills. The Urdaibai Bird Center provides an excellent opportunity to learn about birds and their migrations, with observatories offering close-up views of the marsh and its inhabitants.
Yes, the Urdaibai Biosphere Reserve is home to some of the finest beaches in the Basque Country. Laida beach is known for its constantly changing size and shape, while Laga beach is spectacular, situated at the foot of the imposing cliffs of Peñón de Ogoño. These beaches offer opportunities for relaxation and water sports.


Extend your search for the best caves by checking out these guides of the top ones around Guernica Y Luno: