Palmyra Atoll - USA, Pacific
Palmyra is an equatorial atoll, a circle of 54 small islets covered with lush vegetation, formed by the growth of coral on the rim of an ancient submerged volcano. Palmyra Atoll is a US dependency, a thousand miles south of Hawaii, uninhabited by humans and wild to the core - it is the last intact marine wilderness in the US tropics. The atoll is one of the few nesting areas for seabirds within 450,000 square miles and offers an untouched sanctuary to many rare and endangered species. It is home to 29 bird species, the rare coconut crab, 125 species of stony corals, countless varieties of fish, pods of dolphins and endangered Hawaiian monk seals.