Laysan's ring of sandy dunes surrounds a 100-acre hypersaline interior lake, a feature unique to the Hawaiian Archipelago, and rare in the Pacific as a whole.
Laysan previously harbored 5 unique species, of which two still survive, the Laysan duck and the Laysan finch. In addition, 2 million seabirds nest here.
Pearl and Hermes Atoll is a large atoll with several small islets such as the ones shown here, forming a total of 96 acres of land surrounded by over 300,000 acres of coral reef habitat.
Red Knots pictured here are a cadidate species for listing on the endangered species list. Horseshoe Crab in the foreground. Location is Mispillion Harbor, Delaware.