The Gulf of the Farrallons Marine Sanctuary is home to some of the world's largest great white sharks. These islands (Southeast Farallon and Maintop Island) off the coast of San Francisco are the winter water playground of adult great white sharks measuring 4.5 to 6m. The sharks come to the Farrallons to dine on the local population of Northern Elephant Seals. You'll find yourself rooting for the seals as they compete in a race for their lives against some of the planet's most incredible marine predators.