Heart of Aiako Harria Trail

The terrain on this hike is diverse, characteristic of the Parque Natural de Aiako Harria. You'll encounter unpaved, natural paths, and some sections that might feel alpine. The route often winds through dense oak and beech woods, sometimes mixed with pine forests. Expect mountains, ravines, and numerous streams, which can make some paths muddy, especially after rain. The area features ancient granite peaks and dramatic landscapes with rugged gorges and steep cliffs.

The most significant landmark is the Oianleku Cromlech, an impressive Iron Age megalithic site. You'll also pass by the Kataxulo Borda and Otraitz Hut. The route offers expansive views of the Oiartzun Valley, the Endara reservoir, the mountains of Lapurdi, and Txingudi Bay from various vantage points, including near the Arritxurietako Gaña Summit, Basate Summit (630 m), and Munagirre Summit (781 m).

This specific circular route is rated as 'moderate' due to its distance (~12.2 km) and elevation gain (~638 m), requiring a good level of fitness and sure-footedness. While shorter, easier routes exist to the Cromlech of Oianleku, this full circular trail is generally not recommended for absolute beginners or very young children. Families with hiking experience and older children might find it enjoyable.

The best time to hike this route is typically during spring, summer, and autumn. Spring offers lush greenery and blooming flora, while autumn provides stunning colors in the beech forests. Summer is also good, but be prepared for potentially warmer temperatures. After heavy rain, some sections can be muddy, so consider conditions before you go. Winter hiking is possible but may require appropriate gear and experience due to potentially colder and wetter conditions.

Generally, dogs are allowed on trails within the Parque Natural de Aiako Harria. However, it's always recommended to keep them on a leash to protect local wildlife and ensure the safety of other hikers. Please remember to clean up after your pet.

No, there is typically no entrance fee or permit required to access the trails within the Parque Natural de Aiako Harria, including this circular route. It is a natural park open to the public for recreational activities.

While specific parking for a 'Sorondo circular' trailhead isn't detailed, access points for trails leading to the Cromlech of Oianleku and within the Aiako Harria Natural Park generally have parking available. It's advisable to check local maps or komoot's starting point for the most convenient parking near Sorondo or the Oianleku Cromlech.

Yes, this route shares sections with several other official trails. You will find it intersects with parts of the 'Aiako Arria bihotza', '[CIMA GP10] Bianditz', 'E04 Mendibai ibilbidea: Ereñotzu - Behobia', and 'E14 Epaipide ibilbidea: Ugaldetxo - Aritxulegi' trails, among others like 'Artikutzako trenbide zaharra' and various 'Oieleku bidea' sections.

The Parque Natural de Aiako Harria is rich in biodiversity. Keep an eye out for European mink, desman, and salmon in the streams. Birdwatchers might spot peregrine falcons and griffon vultures soaring overhead. The dense forests also provide habitat for various other bird species and mammals.

While there are no specific cafes or accommodation directly on the trail, the surrounding areas, particularly towns like Oiartzun, offer various options for cafes, pubs, restaurants, and accommodation. It's a good idea to plan your refreshments and overnight stays in these nearby communities before or after your hike.

The Cromlech of Oianleku is a highly significant megalithic site from the Iron Age, considered one of the best-preserved cromlechs in the Basque Country. It's particularly notable for being a double cromlech, consisting of two intersecting stone circles. These structures served as ancient funerary monuments, where the ashes and bones of the deceased were interred, offering a unique glimpse into prehistoric cultures.