French Frigate Shoals (23° 45' N - 166° 10' W) is about 30 miles across and contains a number of small islands. The largest, Tern Island (pictured above), was enlarged during World War II to create an air strip. The Coast Guard was on Tern Island for years, and now the island is occupied by the U.S. Fish & Wildlife Service and seasonally by National Marine Fisheries Service marine mammal scientists.

External link to more information on French Frigate Shoals:  French Frigate Shoals Today