From Donostia to Andoain and Areso through Leitzaran Natural Valley Mon, 27/05/2013 - 18:31 | josean Two parts: 1) Donostia (La Bretxa)-Andoain(Goikoplaza): about 17 km of roads. 2) Andoain (Goikoplaza)-Areso: about 25 km of mountain roads. A total of 42 km.