This summer, we had the opportunity to spend an incredible week in El Hierro, the westernmost island of the Canaries. El Hierro is a veritable paradise declared a biosphere reserve integral (title it shares only two other islands in the world), who live about 8000 people.
The origin of the iron is volcanic, and most of its territory is formed by recent lava. The costs are very high and steep, and there is no sandy beach, although there are natural pools of Tamariu.