Darwin Island is just several miles further North from Wolf Island. At only .4 square miles, it is the 18th largest island in the Galapagos. The Arch at Darwin Island teaming with bird life is splendid from the surface, but when you get underwater and see what's beneath it, you'll have a hard time deciding which side is more magnificent. There is no access to the island, but professional diving is not forbidden around it. Cecil organisms and a variety of tropical and subtropical fishes can be found, for those who love this kind of swimming.