Urbasa-Andia nature park

Urbasa-Andía Natural Park spans two mountain ranges in northern Navarre, Spain – the Sierra de Urbasa and the Sierra de Andía – along with the neighboring Améscoas hills and a protected reserve around the source of the Urederra river. Covering more than 21,000 hectares, the park rises from around 835 meters above sea level up to the summit of Beriáin, which reaches nearly 1,492 meters. It holds one of the largest beech forest areas in Spain and stands as a textbook example of a karst landscape.

How did this landscape form?

Around 65 million years ago, the area now occupied by the Urbasa and Andía ranges lay beneath a sea. Remains of corals, crustaceans and fish accumulated on the seabed, were compressed over time, and hardened into the limestone bedrock that underlies the park today. Centuries of water erosion acting on this limestone base produced the karst features the park is known for: caves, ravines, sinkholes and underground water channels that vanish beneath the surface only to reappear elsewhere as springs.

What can visitors find inside the park?

Beech forest is the dominant feature of the vegetation, covering the high plateaus and north-facing slopes of both mountain ranges. Alongside the forest, mountain pastures have long been used by local livestock farmers. One of the park's best-known viewpoints, Balcón de Pilatos, offers sweeping views over the Améscoa valley from a rocky ledge. Within the park boundaries lies a separate nature reserve protecting the source of the Urederra river, famous for its strikingly clear, turquoise-tinted water and a series of small waterfalls along its course.

The park also preserves traces of ancient human presence. Archaeologists have identified megalithic monuments here, including dolmens, burial mounds and standing stones, evidence that these highlands were inhabited long before recorded history.

What can tourists do here?

A network of marked, themed trails allows visitors to explore the park on foot, by bike or on horseback. Most routes are rated as easy, winding through beech woodland, open grazing land and toward scenic viewpoints. A visitor center near the Olazti-Olazagutía entrance provides maps, trail condition updates and guidance for navigating the karst terrain safely.

When is the best time to visit Urbasa-Andía?

The park is open year-round, but spring and autumn are the most popular seasons, when the beech forest displays its most vivid colors and temperatures are comfortable for longer hikes. In summer, the area around the Urederra springs draws visitors seeking cool water and shade under the tree canopy, while winter blankets the landscape in snow and frost, attracting those looking for quiet, contemplative walks.

Frequently asked questions

Is the park suitable for families with children? Yes, many trails are rated easy and follow relatively flat terrain, though it's worth checking the length of a specific route before setting out.

Does the park have marked trails and visitor infrastructure? Yes, there is a visitor center at the Olazti-Olazagutía entrance along with a network of marked, themed footpaths.

What is worth seeing beyond the beech forests? The Balcón de Pilatos viewpoint and the Urederra river source reserve are the two most recommended highlights within the park.

Is the karst landscape safe to explore without a guide? Karst features such as sinkholes and fissures call for caution, so it's advisable to stick to marked trails, especially in the park's less-frequented areas.