La Palma

La Palma, the green island, has a world record ta show: 

La Caldera del Taburiente  is the world's largest volcanic crater, with a diameter of 9 kilometers and a depth of 770 meters. From the view-point Mirador de la Cumbrecita this terrific natural monument can be overlooked best. 

On the other hand you will find at La Palma the greatest elevation compared to the diameter. 

The island's highest mountain, Roque de los Muchachos, with an astronomical observatory at its peak, measures 2423 meters.

Santa Cruz de la Palma is the island's capital.