The Aitzondo waterfall is located in the Aiako Harria natural park, at the western end of the Pyrenees. This waterfall is one of the largest in Guipuzcoa, with a drop of 140 meters that ends in a small pond.
The impressive glacial valley of Arritzaga was also home to an old copper mine. It is worth stopping to contemplate the ruins of the mine, as well as enjoying the waterfalls and streams that run through the valley.