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Basque Country

Biscay

Top 14 Lakes in Biscay

Best lakes in Biscay are primarily found as reservoirs and former mining areas, offering diverse recreational and ecological value. The region features significant inland water bodies that provide opportunities for nature walks, birdwatching, and enjoying natural landscapes. These water bodies contribute to Biscay's natural heritage, complementing its coastal and mountainous terrain.

Best lakes in Biscay

  • The most popular lakes is Pozo Hostión, a lake that is the largest of 3 wells in its area. Its name is derived from…

Last updated: May 1, 2026

Doña Casilda Iturrizar Park

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The Parque de Doña Casilda is the most famous park in Bilbao. The park is also called parque Casilda Iturrizar, named after the benefactor who donated this park to Bilbao. …

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Txatxarramendi Island

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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 …

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Pozo Hostión

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The largest of the three wells. Its name comes from a Euskaldun foreman who did not speak Spanish well and who always said "I give hostión" to threaten miners who did not work well.

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Aixola Reservoir

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The Aixola reservoir is located between the provinces of Vizcaya and Guipúzcoa. It is surrounded by a beautiful landscape made up of shady pine, oak and beech forests.

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Gorostiza Reservoir

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Beautiful circular walk to the Regato.

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Lakes of the Old Iron Mines

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There are sections of trail with possible mud

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Reservoir Riverside Walk

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A panoramic walk along the banks of the reservoir. Mainly in the shade of native trees, just listen to the birds singing.

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With several sculptures and some picnic tables.

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Ariola Lake Trail

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This wonderful trail that goes around the lake is a great place to enjoy the shade, watch birds and look at the flowers.

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You have to go there once at high and low tide to get a good impression of the fantastic nature reserve

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August 17, 2025, Pozo Ostión Recreation Area

With several sculptures and some picnic tables.

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One of the entrances to the Lakes/Wells.

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The Parque de Doña Casilda is the most famous park in Bilbao. The park is also called parque Casilda Iturrizar, named after the benefactor who donated this park to Bilbao. The park was built between 1912 and 1920 in English romantic style and is an oasis of peace in the city. It is located near the Guggenheim Museum and the Maritime Museum on the Nervión River in the Indautxu district. It is a park to stroll through the 8.52 hectares via the many paths and along the decorative fountain or to watch the birds at the duck pond. Since 1940, the museum of fine arts, the Museo de Bellas Artes de Bilbao, has also been located next to this park.

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You have to go there once at high and low tide to get a good impression of the fantastic nature reserve

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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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A panoramic walk along the banks of the reservoir. Mainly in the shade of native trees, just listen to the birds singing.

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The best lung in the center of Bilbao.

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Small recreational oasis near the Guggenheim Museum.

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Frequently Asked Questions

What are some of the most popular lakes and water bodies in Biscay?

Beyond the well-known spots, visitors frequently enjoy Pozo Hostión, the largest of three wells in its area, and the peaceful Gorostiza Reservoir, known for its circular walks. The Urdaibai Wetlands, a significant biosphere reserve, are also highly regarded for their ecological wealth and bird observation opportunities.

Are there family-friendly lakes or walks in Biscay?

Yes, several areas are ideal for families. The Aixola Reservoir offers walks suitable for all families, surrounded by beautiful pine, oak, and beech forests. The Gorostiza Reservoir also provides a peaceful environment with flat, short routes perfect for a family stroll. Additionally, Txatxarramendi Island and the Doña Casilda Iturrizar Park (an urban oasis with a lake feature) are noted as family-friendly.

What kind of natural features can I expect to see around Biscay's lakes?

Biscay's lakes are often nestled within diverse natural settings. You can find stunning landscapes with beech, oak, and pine forests, particularly around areas like the Aixola Reservoir and within the Gorbeia Natural Park, which hosts the charming Lamioxin Lagoon. The Urdaibai Wetlands are a prime example of ecological wealth, featuring marshes, sandbanks, and a wide array of birdlife.

Are there opportunities for birdwatching near Biscay's lakes?

Absolutely. The Urdaibai Wetlands are a significant wetland on the Cantabrian and Atlantic coast, known as an ideal place to observe a large number of birds. The Urrunaga Reservoir, often described as an 'inner sea sited among mountains,' is also an excellent spot for birdwatching, offering tranquil nature walks.

What kind of hiking or walking trails are available around the lakes?

Many lakes offer pleasant walking opportunities. The Gorostiza Reservoir is known for its beautiful circular walk to Regato. The Zollo Reservoir is ideal for gentle walks, and the Gorbeia Natural Park, home to Lamioxin Lagoon, features a network of signposted paths for hikers. For more extensive options, you can explore various running trails in Biscay that may pass near these water bodies.

Can I find more challenging trails or specific outdoor activities near the lakes?

While many lake areas offer gentle walks, the broader region provides more challenging options. The Gorbeia Natural Park, which includes Lamioxin Lagoon, is popular for hiking, mountaineering, and mountain biking. For cycling enthusiasts, there are numerous gravel biking and road cycling routes throughout Biscay, some of which may pass by or near these scenic water bodies.

Are there any historical or unique sites related to the lakes in Biscay?

Yes, the Lakes of the Old Iron Mines offer a unique historical perspective, showcasing former mining areas transformed into natural monuments. Pozo Hostión also has a local story behind its name, derived from a foreman. While not strictly in Biscay, the nearby Laguardia Lakes Biotope in Rioja Alavesa combines ecological interest with historical monuments in the winemaking region.

What is the best time of year to visit the lakes in Biscay?

The lakes in Biscay can be enjoyed throughout the year, with each season offering a different experience. Spring and autumn are particularly pleasant for walking and birdwatching, as the weather is mild and the landscapes are vibrant with changing colors or new growth. Summer is ideal for enjoying the recreational areas, while winter offers a tranquil, often misty beauty, though some trails might have muddy sections, especially around areas like the Lakes of the Old Iron Mines.

Are there any facilities or recreation areas near the lakes?

Some lake areas are equipped with facilities. The Pozo Ostión Recreation Area, for example, offers facilities for visitors. Within the Gorbeia Natural Park, which includes Lamioxin Lagoon, you can find well-equipped recreational areas like Pagomakurre on the Biscay side, providing amenities for visitors.

Can I find urban lakes or parks with water features in Biscay?

Yes, while many lakes are natural or reservoirs, Bilbao also features urban green spaces with water elements. The Doña Casilda Iturrizar Park in Bilbao is a notable example, offering an urban oasis with a lake feature, perfect for a leisurely stroll within the city.

What do visitors enjoy most about the lakes in Biscay?

Visitors frequently appreciate the peaceful environment and the opportunity for tranquil walks, as highlighted by the Gorostiza Reservoir. The ecological wealth and bird observation opportunities at places like the Urdaibai Wetlands are also highly valued. Many enjoy the beautiful landscapes, including the shady forests surrounding reservoirs like Aixola.

Are there any lakes that are particularly good for picnics?

While specific picnic spots are not always highlighted for every lake, many of the family-friendly areas and those with recreational facilities are suitable for picnics. The peaceful settings of reservoirs like Gorostiza Reservoir and the natural beauty of the Aixola Reservoir, with their surrounding forests, provide excellent backdrops for an outdoor meal.

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