Air photo of the Koko rift section of O'ahu (the E and of Ko'olau volcano). This prominent line of vents built up after erosion had carved deep valleys into this southeastern end of the Ko'olau volcano. The dashed pink lines mark the rims of phreatomagmatic craters, and the two pink dots mark non-phreatomagmatic "dry" vents. The green line is the crest of the Ko'olau mountains, which in this part of the volcano, roughly marks the top of the giant landslide scarp. Hanauma Bay is obvious with its white sand beach, Koko Crater is the tallest cone, and Manana Island marks the northeast end of the rift.

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