Located on the edge of the badlands and covered with black volcanic ash, the vineyards of La Geria valley look like they have been transplanted here from another planet. The Lanzaroteños found an indigenous way of cultivating vines on this arid and hostile ground. They dug more than 10,000 funnel-shaped hollows into the thick layers of picón, planted the vines, only one vine per hollow, filled them with soil and poured thick layers of picón over it, as the porous volcanic granules ideally retain the night humidity to feed the plants. In order to protect them from the constant winds and drying out, they built low, semicircular walls around them.