You have reached Yellowcliff Bay in the settlement of Cotton Valley. Park your car along East End Road and admire this display of nature. On the horizon about two miles away is Buck Island. This uninhabited islet has the wonderful Turtle Beach – among the best in the Virgin Islands – and hiking trails. But what really distinguishes Buck Island is below the water: the 4,554 acre elkhorn-coral barrier reef. This marine garden is inhabited by over 250 species of fish and sea creatures. Buck Island is an Underwater National Monument, one of only two in the United States.