Best natural monuments around Nabarniz are found within a municipality nestled in Bizkaia's Busturialdea region, known for its rich natural landscape. The area is situated within the Urdaibai Biosphere Reserve, offering diverse ecosystems and significant natural features. These sites provide opportunities for outdoor exploration, showcasing a blend of scenic beauty and ecological importance. The elevated position of Nabarniz within the reserve, surrounded by native forests and pastures, makes it a key location for experiencing the region's natural heritage.
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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One of the most unique natural monuments is the Oma Forest, also known as the 'Painted Forest'. Here, artist Agustín Ibarrola transformed tree trunks into a canvas with geometric motifs and figures, creating a distinctive blend of art and nature. Another significant site is Old Tree of Gernika (Gernikako Arbola), an oak tree with deep historical significance.
Yes, Iluntzar Mountain, the highest peak in the Busturialdea region, acts as a natural balcony. From its summit, you can enjoy extraordinary panoramic views of the Urdaibai Biosphere Reserve, the Oka River's valley, and the surrounding holm oak woods.
The area around Nabarniz is excellent for various outdoor activities. You can find numerous MTB trails, including routes like 'Centro BTT Urdaibai Ruta 11 – circular desde Navárniz'. There are also many options for cycling and gravel biking, with routes exploring the diverse landscapes of the Urdaibai Biosphere Reserve.
Absolutely! The Oma Forest is considered family-friendly, offering an engaging experience as children can discover the painted trees and artistic installations. The broader Urdaibai Biosphere Reserve also provides many accessible areas suitable for families to enjoy nature.
Beyond its natural beauty, Nabarniz boasts historical natural sites. The Artzubi Bridge, a 16th-century Romanesque bridge, is a historical site that blends seamlessly with its natural surroundings and is part of the Camino de Santiago itinerary. Additionally, the Ereño Marble Quarries, though now disused, are a historical natural monument where Romans exploited marble as early as the 1st century AD.
The natural monuments around Nabarniz, particularly those within the Urdaibai Biosphere Reserve, are beautiful year-round. Spring and autumn offer pleasant temperatures for hiking and exploring, with vibrant foliage or blooming flora. Summer is ideal for enjoying the coastal areas within the reserve, while winter can provide a tranquil, serene experience, especially in the forests and mountains.
The Urdaibai Biosphere Reserve is characterized by an extraordinarily beautiful and varied natural landscape. It features mountains, valleys, extensive indigenous forests like the Basondo Holm Oak Woods, and the course of the Oma brook, which creates 'awesome and cosy spots'. The heart of the reserve is the Oka River, which transforms into spectacular marshes upon reaching Mundaka, rich in life and best appreciated at different tides.
While specific 'easy' trails are not detailed in the data, the diverse terrain around Nabarniz, including forests and high valleys, offers options for various skill levels. Many trails leading to Iluntzar Mountain, for instance, have sections suitable for different abilities. The experience of walking through the Oma Forest is generally considered an accessible and enjoyable walk for most visitors.
Visitors highly appreciate the blend of scenic beauty, ecological significance, and unique experiences. The Oma Forest is praised for its artistic and environmental fusion, offering a distinctive and memorable visit. The tranquility and authentic rural Basque experience, along with stunning vistas from places like Iluntzar Mountain, are also frequently highlighted by those exploring the area.
Yes, several natural monuments double as excellent viewpoints. Iluntzar Mountain provides extensive panoramic views of the Urdaibai Biosphere Reserve. Additionally, the broader Urdaibai Biosphere Reserve itself contains numerous spots that offer breathtaking vistas of its diverse landscapes, including its unique marshes and coastline.
While specific dog-friendly designations for each natural monument are not explicitly provided, generally, outdoor natural areas like the Urdaibai Biosphere Reserve, including its forests and trails, are welcoming to dogs, provided they are kept on a leash and owners follow local regulations regarding waste. It's always advisable to check specific site rules upon arrival.


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