Best natural monuments around Cenarruza-Puebla De Bolívar are situated within the municipality of Cenarruza-Puebla De Bolívar, also known as Ziortza-Bolibar, in the province of Bizkaia, Spain. This region is part of the Urdaibai Biosphere Reserve, recognized by UNESCO for its ecological value. The landscape features diverse ecosystems, including low mountains, marshlands, and coastal areas. It offers a blend of natural beauty and cultural heritage.
Last updated: July 15, 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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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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This 770 meter high summit is an excellent vantage point from which to observe the mountains that surround us. It is an outcrop of slate. At its vertex, in addition to beautiful views, you can find several mailboxes.
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This hexagonal-shaped hermitage from the 18th century was built because the previous one was in ruins. The three large rocks inside draw attention, holding each other together. Within these rocks is the figure of the Archangel Saint Michael.
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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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Viewpoint from which to enjoy the most mountainous landscape of the Urdaibai basin. Located on the slopes of the Oiz, the balcony of Bizkaia is an emblematic enclave from where you can see the forest mass of the area in all its breadth. There is a legend that tells that this place was a place where the witches met when night fell. More info at: https://www.urdaibai.eus/es/balcon-de-bizkaia/
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The region is primarily known for its inclusion within the Urdaibai Biosphere Reserve, a UNESCO-recognized area. This reserve features diverse ecosystems including low mountains, extensive marshlands, and coastal areas. You can also explore unique geological formations like the slate outcrop at Kalamua Summit, which offers panoramic views.
Yes, the region beautifully blends natural beauty with cultural heritage. A notable example is the Artzubi Bridge, a Romanesque bridge from the 16th century that is part of the Camino de Santiago route and is well-integrated into its natural surroundings. Additionally, the Santimamiñe Caves, located near the Oma Forest, house significant prehistoric paintings and are a World Heritage Site.
The Urdaibai Biosphere Reserve, which encompasses many of the natural monuments, is a crucial stopover and wintering ground for migratory birds. Therefore, spring and autumn are excellent for birdwatching. For hiking and general exploration, the milder temperatures of spring and early autumn are ideal. Summer offers warmer weather for coastal activities, while winter can be quieter but may have more challenging conditions for some trails.
Absolutely. The Oma Forest, also known as the 'Painted Forest,' is a unique and interactive experience suitable for families, featuring art painted on tree trunks. The Balcón de Bizkaia Viewpoint and the Hermitage of San Miguel de Arretxinaga are also considered family-friendly attractions.
While many natural areas in the region are generally dog-friendly, it's always best to check specific regulations for each site, especially protected areas like the Urdaibai Biosphere Reserve. Always keep dogs on a leash and clean up after them to preserve the natural environment and respect other visitors.
The region offers a variety of outdoor activities. You can find numerous routes for hiking, including moderate trails like the Urregarai and Santa Eufemia Trail. For cyclists, there are options for cycling and gravel biking, with routes like the Itsasaurre Bridge – Lekeitio loop. The Urdaibai Biosphere Reserve is also excellent for birdwatching.
Yes, there are several hiking trails to explore. For a moderate challenge, consider the Urregarai and Santa Eufemia Trail. If you're looking for a longer, more difficult hike, the Akarregi y Kalamua circular route from Markina-Xemein is an option. You can find more details and routes on the hiking guide for Cenarruza-Puebla De Bolívar.
Visitors particularly appreciate the unique blend of art and nature found in the Oma Forest, where painted trees create an interactive outdoor gallery. The historical significance of sites like the Artzubi Bridge and the panoramic views from Kalamua Summit are also highly rated. The overall natural beauty and diverse ecosystems of the Urdaibai Biosphere Reserve are consistently praised.
Parking availability varies by location. For popular sites like the Oma Forest and Santimamiñe Caves, designated parking areas are usually provided nearby. For trailheads leading to summits or more remote natural monuments, parking might be available in nearby villages or smaller, informal spots. It's advisable to check specific access information for each monument before your visit.
Public transport options to some natural monuments, especially those within the Urdaibai Biosphere Reserve, may be available, though they might require some planning. Buses often connect larger towns in the Bizkaia province. For specific routes like the Oma Forest or Santimamiñe Caves, local bus services might operate, but schedules can be limited. Checking local transport websites for current routes and times is recommended.
The region boasts unique geological features, such as the slate outcrop at Kalamua Summit. The Urdaibai Biosphere Reserve is a haven for wildlife, particularly birds, with up to 250 species observed throughout the year. Its extensive marshlands are vital for migratory birds, making it a prime location for birdwatching. You might also spot various other flora and fauna typical of the Cantabrian holm oak woods and coastal areas.
The municipality of Cenarruza-Puebla De Bolívar and surrounding towns offer various options for dining and accommodation. You can find local restaurants, cafes, and pubs in villages within and around the Urdaibai Biosphere Reserve. For accommodation, there are rural guesthouses, hotels, and campsites available, especially in towns like Kortezubi or Gernika-Lumo, which are close to major attractions like the Oma Forest and Santimamiñe Caves.


Extend your search for the best caves by checking out these guides of the top ones around Cenarruza-Puebla De Bolívar: