La Sierra Trail

The trail is located within the Valderejo Natural Park. Parking is typically available at the park's main access points, such as Lalastra, which serves as a common starting point for routes in the area. It's advisable to check for specific parking areas near the trailhead before your visit.

The Valderejo Natural Park offers a pleasant hiking experience throughout much of the year. Spring and autumn are generally ideal, with milder temperatures and vibrant natural colors. Summer can also be good, but be prepared for warmer weather. Winter hiking is possible, but some sections might be more challenging due to weather conditions.

This moderate hike features diverse terrain. You'll traverse a spacious valley, steep hillsides, rocky crags, and cliffs. The path includes sections through forests of holm oaks, gall oaks, and beech trees, as well as areas with extensive wild pine masses. Near Portillo de Leron, heather is prominent. Expect a mix of well-trodden paths and some rocky sections, requiring sure-footedness.

Generally, dogs are allowed in Valderejo Natural Park, but they must be kept on a leash to protect the park's wildlife and natural environment. Always ensure your dog is under control and follow any specific signage or regulations posted within the park.

Valderejo Natural Park typically does not require specific hiking permits or entrance fees for general access to its trails. However, it's always a good idea to check the official park website or visitor center for any updated regulations or special requirements before your visit.

The route offers several notable features. You'll pass through Portillo de la Sierra and Portillo de Leron, and the San Lorenzo Hermitage, which provides spectacular panoramic views. You'll also encounter Recuenco/Leron and Alto de las Arrayuelas (1,119 m). The trail also includes sections near the Purón River and offers views of Mount Recuenco, the highest peak in the park.

Valderejo Natural Park is renowned for its rich fauna. It hosts the largest colony of griffon vultures in the Basque Country, which you can often observe soaring, especially from viewpoints like the San Lorenzo Hermitage. Other raptors such as goshawks, short-toed snake eagles, and Egyptian vultures are also present. The park's diverse habitats support a variety of other animal species.

Yes, this circular route shares sections with several other trails within the park. You will find parts of the Ibarreko goialdean barrena, Purón ibaiaren ibilbidea, Artzaintza naturbidea, and the GR 282 Bóveda - San Millan de San Zadornil routes along the way.

This trail is classified as 'moderate'. While it doesn't require advanced technical skills, its length (approximately 16.3 km) and elevation gain (around 385 m) mean a good level of physical fitness and sure-footedness are necessary. It might be challenging for absolute beginners but is manageable for those with some hiking experience.

Beyond its natural beauty, the trail offers glimpses into the region's past. Near the San Lorenzo Hermitage, you can find an ancient tomb field. Additionally, the monolith of Monte Lerón is another historical trace within the park, adding a cultural dimension to your hike.