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See Hoya de Fireba, El Hierro Island, Canary Islands
The Caldera de la Hoya de Fireba has a diameter of around 260 metres and is about 110 metres deep. It is located on the central axis where the three volcanic ridges of the island meet. La Hoya de Fireba was formed during the middle series of the three stages of island formation, which ended about 6,000 years ago.
Calderas of this type are called explosion craters. They are formed by the collision of magma with water deposits. The volcanic crater is considered to be the best preserved of the three on El Hierro. On the side of the crater facing the El Golfo valley, tree heather has settled, aided by the moisture from the passing clouds. Potatoes were also grown in the shallow depression inside the caldera. The moisture running down the walls of the crater was used to irrigate the plants.
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