This is Teide, the highest mountain on the Canaries, on Tenerife.
La Palma is the 'steepest' island in the world. The massive Caldera de Taburiente has given its name to all calderas the world over. All La Palma's mountains are volcanic and one - Teneguia - erupted as recently as 1971.
Click the photos for a better idea of the scale of these mountains