canary islands, tenerife

18th 720 1798 above approximately around ash badland barren beauty black boulder brown canary century covered crater dead death del diameter eroded erosion erupted eruption gravel ground highest hikes huge islands landscape lava level lifeless malpais many metres mount mountain nacional national old orange origin orotava outline park parque pass path peak pico rock route sea second severe silhouette teide tenerife viejo volcanic walks wasteland yellow