Cenebio de Valeron, a historic archaeological site in Gran Canaria. The cave complex includes around 200 silos hollowed out of the cliff that were used to store grain. 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.