Acantilados de Los Gigantes are vertical cliffs along the western coast of Tenerife. They are vertical walls reaching heights of 500 metres in some places. They are a basaltic geological feature.
In times of the Guanches they were known as the "Wall of Hell".
Wikipedia https://en.wikipedia.org/wiki/Acantilados_de_Los_Gigantes
Address 38480, Spain
Coordinates 28°17'54.551" N -16°52'13.154" E