Munagirre and Oianleku Cromlech Loop

This trail is classified as difficult for trailrunning. It requires a very good fitness level, sure-footedness, and sturdy shoes. Some sections may also benefit from alpine experience due to varied terrain and steep descents.

The route features varied terrain, including pleasant grassy paths, sections through streams and a beech forest, and ridgeline traverses. You'll encounter steep descents, mountainous landscapes with granite, and clean undergrowth. There is a known impassable and muddy tunnel that should be avoided.

The starting point of the Basate y Munagirre trail is conveniently located next to a car park, making access straightforward for those arriving by car.

You'll be treated to stunning 360-degree panoramas of the Southern Basque Country, the Labour coastline, and views extending to San Sebastian and the peaks of the Three Crowns (Aiako Harria). The trail also passes significant megalithic structures, including the Oianleku Cromlech and the Basate cromlechs. You'll also pass through a beautiful beech forest and might spot remnants of the old Artikutza train track and ruined buildings.

As this trail is located within the Aiako Harria Natural Park, dogs are generally allowed but must be kept on a leash to protect wildlife and ensure the safety of other trail users. Always follow local park regulations.

Typically, there are no specific permits required or entrance fees to access the trails within Aiako Harria Natural Park for recreational activities like trailrunning. However, always check for any updated local regulations before your visit.

The trail offers beautiful scenery year-round, but spring and autumn are often ideal for trailrunning due to milder temperatures and vibrant natural colors. Summer can be warm, and winter might present colder conditions or snow at higher elevations, requiring appropriate gear.

Yes, the route intersects with several other paths. You will find yourself on sections of the Artikutzako trenbide zaharra, Aiako Arria bihotza, E04 Mendibai ibilbidea: Ereñotzu - Behobia, and E14 Epaipide ibilbidea: Ugaldetxo - Aritxulegi trails, among others.

Be aware that while much of the path is generally wide, there are sections with steep descents, particularly when crossing streams. The trail also includes a muddy and impassable tunnel that should be avoided. Given the 'difficult' rating, ensure you have appropriate footwear for varied terrain and good sure-footedness.

For an experienced trailrunner, this circular route, which is approximately 9.6 kilometers long with about 360 meters of elevation gain, typically takes around 1 hour and 30 minutes to complete. This duration can vary based on individual fitness and pace.

While the trailhead itself is next to a car park, specific facilities like cafes or restaurants are not directly on the trail. You would likely find options in nearby towns or villages surrounding the Aiako Harria Natural Park, such as Oiartzun.