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Diploria clivosa
Brain Coral spotted at the Hanauma Bay Nature Preserve on the island of Oahu, Hawaii.
This is not knobby brain coral, because knobby brain coral lives in the Atlantic. See here: https://en.wikipedia.org/wiki/Pseudodipl... This is probably Porites lobata (a species of lobe coral). See here: https://www.waikikiaquarium.org/experien...