Two monolithic rocks planted in the middle of the ocean and in a good state of conservation that are only accessible by sea. Both the Roque de Tierra (or Roque de Dentro) and the Roque de Fuera, constantly defy the Atlantic waves with their majestic presence. Both formations constitute one of the most characteristic ecological systems of the Canary Islands, standing out for their great scientific, geological, geomorphological and landscape interest. The vertebrate fauna that inhabits these rocks is important, since several endemic species occur here, and some, such as the giant lizard of the Roque de Fuera (Gallotia galloti insulanagae), have their only known population here. Among the birds are populations of Bulwer's petrel (Bulweria bulwwerii), Madeira storm petrel (Oceanodroma castro) and Scopoli’s shearwater (Calonectris diomedea). At the top of the Roque de Tierra there is a spectacular grove of dragon trees, with almost a hundred specimens.