SL GI-36: DESDE ZERAIN A LAS MINAS DE AIZPEA
This route has two sections. One is associated with water, where you go through Larraondo mill-sawmill and Iñurrategi wetland. The other section is related to iron, where you will see remains of minerals, forests from where coal was obtained, several mine entrances, tunnel, train tracks, and the giant chimneys of the three calcination ovens, mineral aerial transport system. Finally the way back ascending through the Aizpe-erreka to Zerain.