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San Marko Fort, viewpoint of Oarsoaldea

San Marko Fort, viewpoint of the area  San Marko Fort, viewpoint of the area

Standing in a privileged spot, deep in the countryside at less than 10 km from San Sebastian, the San Marko Fort is most certainly the best vantage point in Oarsoaldea. Its perfect location makes it an important and privileged viewpoint of Gipuzkoa's coast, where you can admire the famous bays of La Concha, Pasaia and Txingudi among other places of interest.
This military structure located on the top of mount Bizarain at 260 m altitude was built in the 19th century over the town of Errenteria for the defense of the area. Nowadays it does not have any military use; the San Marko Fort was occupied by the army until 1970 and today is integrated into Lau Haizeta Park, forming part of the leisure-cultural area.

Discover its secrets

Discover the sensation of a century-old military structure by visiting parts of the fort never before opened to the public. Learn about the history of the building as you travel back in time. Take the panoramic lift and enjoy spectacular views of the surrounding area.

A lot to do

1. Visit the San Marko Park and Cultural Area, its cultural heritage and beautiful countryside of Lau Haizeta Park.
2. Walk the well-marked paths round San Marko Fort and Txoritokieta.
3. Relax in the picnic area and playground.

Lau Haizeta Park

Don't forget to visit Lau Haizeta Park. In addition to the fort at San Marko, you´ll also discover the nearby Txoritokieta Fort. And as you walk along the various paths that wind through the park, you´ll come across stone monuments including Berrozpin, the Txoritokieta monolith and the Aitzetako Txabala dolmen.

To visit

Front Desk / Tourist Information Point: A room of the fort now serves for the reception of visitors, and provides tourist information of Errenteria and the Oarsoaldea Region.
Lower Floor: The military activity has been recreated in the spaces below by settling a few replicas: machine guns, cannons, soldiers, artillery and more... In addition, visitors can obtain information on what they are seeing through information panels installed and available in several languages.

  • Caponier
  • Half Caponier
  • Battery Fires Curved
  • Battery to Barbeta


  • Private parking. Limited parking places.



San Marko Fort
San Marko bidea,z/g
20100 Errenteria


See location


San Marko Fort Information Point
San Marko bidea, z/g
20100 Errenteria (Gipuzkoa)

Tel..: (00 34) 943 449 638


Interesting information

Fort-Museum and San Marko Fort Information Point:


Open from Easter for 6 months

Weekends and public holidays:

  • 10:00-14:00
  • 16:00-18:00

July and august

From wednesday to sunday and holidays:

  • 10:00-14:00
  • 16:00-18:00

You can visit the Fort with your dog while it is on a leash. In the parking you will find a fountain, and around the fort you can do different routes with your dog. 

San Marko Day:

Celebrated on the 25th April, this day has special meaning for the locals. Special cakes are made on this day, called "opilak", which godparents give to their single godsons as tradition dictates. A traditional festival called Erromeria is held at the fort and its surroundings on the Sunday closest to the saint´s day.


Self-guided tour: free . (The museum is opened only in high season)

Guided tour (check availability): free

Guided tours for groups, booking in advance: 0034 943 449 638.



More information

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