A panoramic view of the Caldera de Bandama, near Telde in Gran Canaria, a collapsed volcanic crater or sink-hole about 1000m wide and 200m deep that is now a tourist attraction. The Atlantic Ocean is visible at top left. Gran Canaria is the second most populous of the Canary Islands, a group of seven main islands, and a number of smaller islets, in the Atlantic Ocean off the coast of Morocco. The Canaries are known as autonomous communities of Spain and their economies are based largely on tourism.