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The Galápagos Islands (Spanish: Islas Galápagos, pronounced [ˈislas ɣaˈlapaɣos], local pronunciation: [ˈihlah ɣaˈlapaɣoh]) are an archipelago of volcanic islands. They are distributed on each side of the equator in the Pacific Ocean, surrounding the centre of the Western Hemisphere, and are part of the Republic of Ecuador. Located 906 km (563 mi) west of continental Ecuador, the islands are known for their large number of endemic species that were studied by Charles Darwin during the second voyage of HMS Beagle. His observations and collections contributed to the inception of Darwin's theory of evolution by means of natural selection.