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An island centers in the image, with clearly defined sandy shores in the bright blue Indian Ocean. However, there is a dark ring created by a reef around the island, some bright sand peaks above the water. There is also a sandbar going up the left side of the image.

Montgomery Reef Revealed

Large tidal swings expose a plateau-shaped reef around Australia’s Yawajaba island at low tide. View the full story

Image Credit: NASA Earth Observatory / Lauren Dauphin
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