Monte Jaizkibel is a giant slab of rock sitting at 547m that acts as a defensive wall, protecting the inland towns and fields from the angry, invading ocean. A very strenuous walking trail (4km west of Hondarribia) and a car-taxing road wend their way up the mountain to a ruined fortress and spectacular views. From here you can walk all the way to Pasaia (another 12km).