Best natural monuments around Ason showcase a diverse landscape characterized by significant geological formations and natural features. The region offers a variety of natural attractions, from impressive waterfalls to deep caves and panoramic viewpoints. These sites provide opportunities to observe the natural environment and its unique characteristics. Ason's natural monuments are integral to its regional identity and offer insight into its geological history.
Last updated: June 23, 2026
Highlight • Waterfall
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Highlight • Cave
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Highlight (Segment) • Gorge
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Beautiful lonely valley end before the short and partly shady climb to Canal Honda
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Nice path through lush meadows. Only animals, no people.
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Today we made the official visit to the cave, it's a pity they didn't let us take photos inside.
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You can pass by here and think that you are simply in front of another area of limestone rock, so abundant in this area, but La Lastrera is much more than that, it is the abrasion ramp through which the glacier plunged into the Asón valley. . In this area during the Quaternary, the glaciers reached the lowest level in southern Europe, reaching 400 meters above sea level. Be very careful not to enter it on foggy days or, above all, with snow, you can rush into one of its large cracks.
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Mythical place on the routes of the Collados del Asón Natural Park
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It is highly recommended to fill the canteen here, as well as see the information panel.
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Just amazing and a ride for the whole family! It is a complex of karstic caves 12 km long with cavities of immense dimensions of up to 14 x 28 meters in some sectors. The water has been forming these incredible caves that fortunately today can be visited and explored. It is necessary to purchase tickets online, you can check here: https://cuevas.culturadecantabria.com/cullalvera-esp/
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The Ason region is known for a diverse range of natural monuments, including impressive waterfalls like Asón Waterfall, deep caves such as Cullalvera Cave, and panoramic viewpoints like Covalruyo Viewpoint. You can also find gorges, like the 700-meter long Canal Honda, and other unique geological formations.
Yes, several natural monuments around Ason are suitable for families. Asón Waterfall is considered family-friendly, offering a spectacular sight. Another great option is Cullalvera Cave, which provides an accessible and engaging experience for all ages. Additionally, Fuente Bezón is a family-friendly natural spring.
For those seeking a more challenging experience, Cubera Cave is categorized as challenging. Additionally, the summit of Peña Lusa offers challenging terrain and rewarding views. La Lastrera de Saco is another challenging natural monument in the region.
The Ason region offers several viewpoints with impressive vistas. Covalruyo Viewpoint is highly recommended for its views of the valley and local geomorphology. Alto de la Posadía and Brenarromán also provide excellent panoramic views. For a summit perspective, Peña Lusa offers challenging trails leading to rewarding views.
Yes, the Ason region features notable cave systems. Cullalvera Cave is a complex of karstic caves, 12 km long, with immense dimensions. It's possible to visit and explore, but tickets should be purchased online. Another cave, Cubera Cave, offers a more challenging exploration experience.
Visitors frequently describe the Asón Waterfall as 'spectacular' and 'incredible,' especially after heavy rains. The Cullalvera Cave is praised as 'just amazing' and a 'ride for the whole family.' The Canal Honda gorge is noted for giving a 'feeling of smallness' among its immense limestone walls, and Covalruyo Viewpoint is considered 'essential for lovers of geomorphology' due to its impressive views.
Yes, the Ason region offers various trails suitable for hiking and running. For running, you can explore routes like the 'Asón Valley Trail' or the 'Asón Waterfall loop from Asón.' More challenging options include the 'Brenarromán – Canal Honda loop from Soba.' You can find more details on these and other running trails in the Running Trails around Ason guide.
Absolutely. The Ason area provides several mountain biking trails. Notable routes include the 'Nacimiento del río Asón y Alto de la Posadía – circular por el Parque Natural de los Collados del Asón,' which takes you through the natural park. Other options like 'Campo La Cruz y Alto de Fuente Las Varas' offer difficult terrain for experienced riders. Discover more MTB trails in the MTB Trails around Ason guide.
The ideal time to visit can depend on the specific monument and your activity. For waterfalls like Asón Waterfall, visitors note that the amount of water greatly influences its spectacle, with heavy rains making it particularly impressive. Generally, spring and autumn offer pleasant weather for exploring, though autumn weather conditions can vary. Always check local forecasts before your visit.
Yes, road cyclists can find routes that incorporate the natural beauty of Ason. The 'Collados del Asón Park Loop' is a difficult road cycling route that takes you through the natural park. Other challenging routes like 'Puerto de Alisas – Portillo Lunada loop from Gibaja' also offer scenic rides in the wider region. For more road cycling options, refer to the Road Cycling Routes around Ason guide.
Yes, you can find Fuente Bezón, a natural source that comes directly from the mountain. It's highly recommended by visitors to fill your canteen here with very cold water before continuing your walk or hike.


Find even more amazing natural monuments around Ason by checking out the top Highlights region by region:
Extend your search for the best caves by checking out these guides of the top ones around Ason: