This mountain Ultra-Trail®, which is run across 5 regions, goes through back roads and trails. The start and finish lines are in Beasain and there is a maximum completion time of 48 hours. Ehunmilak is a circular route that goes through the towns of Beasain, Zumárraga, Urretxu, Azpeitia and Tolosa.
The race involves climbing several mountain summits where conditions may become difficult due to darkness, wind, cold and rain, therefore one must carry compulsory security equipment.
In parallel to Ehunmilak (ehm) is the Goierriko Bi Haundiak (g2h) that will set out from Beasain and will be run across the Goierri region. g2h is 88 kilometres long and has a 6000 metre cumulative positive elevation gain that will take the runners through the mountain ranges of Aralar and Aizkorri where it joins the original ehunmilak route.
Also, there is marimurumendi marathon (mmm). This race will also set out from Beasain and it will run through the surrounding mountains. The race is 42.195 km long and has a 2.200 m cumulative positive elevation gain.