Funerary monument dating from the Iron Age (800 to 300 BC), the cromlechs are circles of stones driven vertically into the ground. In the centre of this burial is a chamber called a “ciste”, in which the cremated remains of the deceased were placed. The cromlechs are a true witness to the very ancient occupation of the Basque mountains. At the Mehatse pass, explanatory panels give precise information on this type of monument.