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In page Turtle Bay, Oʻahu:

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The beach is sandy but the swimming conditions are poor because the ocean floor near the shoreline is rocky. There is a large limestone shelf that spans almost the entire length of the bay.[2] The coastal underwater formations are home to one of the most striking limu (algae) found in the Islands.[citation needed] Martensia fragilis grows on rocks in tide pools and on reef flats. This iridescent species ranges from light blue to pink and orange in color.[3]