Greater Farallones and Cordell Bank National Marine Sanctuaries are part of a globally significant, extraordinarily diverse, and productive marine ecosystem that supports abundant wildlife and valuable fisheries. The sanctuaries provide breeding and feeding grounds for at least twenty-five endangered or threatened species; thirty-six marine mammal species, including blue, gray, and humpback whales
, harbor seals, elephant seals, Pacific white-sided dolphins, and one of the southernmost U.S. populations of threatened Steller sea lions; over a quarter-million breeding seabirds; and one of the most significant white shark populations on the planet. Below the water vibrant seafloor habitats of invertebrates, fishes and algae support this amazing biodiverse ecosystem. Recognizing its global value, Greater Farallones and Cordell Bank National Marine Sanctuaries are part of the Golden Gate Biosphere Reserve.