Gilbert and Ellice Islands the latitude of 5° to 10° south and longitude of 176° to 180°, west of the International Date Line. The Ellice Islands are midway between Hawaii and Australia. The Ellice Islands are recognised as part of the Polynesia subregion of Oceania. In 1606 Pedro Fernandes de Queirós sighted Butaritari and Makin, which he named the Buen Viaje (‘good trip’ in Spanish) Islands. The Gilbert Islands were named in 1820 by a Russian Admiral, Baron Johann von Krusenstern, after a British captain, Thomas Gilbert, who encountered the archipelago in 1788 while exploring an Outer Passage route from Port Jackson to Canton.
Endemism in the Hawaiian Islands was critical to the formulation of his theory of evolution is far exceeded in the more isolated Hawaiian Islands. The relatively short time that the existing main islands of the archipelago have been above the surface of the ocean (less than 10 million years) is only a fraction of time span over which biological colonization and evolution have occurred in the archipelago. High, volcanic islands have existed in the Pacific far longer, extending in a chain to the northwest; these once mountainous islands are now reduced to submerged banks and coral atolls. Midway Atoll, for example, formed as a volcanic