The Islands are Formed Entirely from Coral, Not Volcanic Rock

Unlike many oceanic islands, the Cocos (Keeling) Islands are true coral atolls, meaning they are rings of coral reefs built atop submerged ancient volcanoes. The visible landmass is entirely biogenic, created by living organisms over millennia.

Source

https://en.wikipedia.org/wiki/Cocos_(Keeling)_Islands#Geography

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Published: March 30, 2026
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Cocos Islands Geology Ocean Nature Coral Atoll Geological Formation Coral Reef Oceanography Island Geography

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