Spanish for "The Green Caves" are not actually green, but a natural lava tube of the Haria municipality on the island of Lanzarote in the Canary Islands. The cave lies within the Monumento Natural del Malpaís de La Corona, a protected area, and was created around 3,000 years ago by lava flows erupting from the nearby volcano Monte Corona, flowing across the Malpaís de la Corona toward the sea. The lava streams cooled on top, developing a solid crust, before the lava drained away leaving the top part as the roof of a cave. The caves extend for 3.7 miles above sea level and for another mile below the sea, meaning that the caves are constantly half flooded with many natural lakes holding extremely clear water which are regulated by the Atlantic Ocean. This micro climate is home to a species of blind albino crabs known as 'Jameitos' which can be found nowhere else on earth. These crabs have been adopted as the symbol of the Jameos del Agua.