Blenheim Reef is a partly submerged atoll structure in the Chagos Archipelago in the Indian Ocean, including the coral reef of Baxio Predassa on its southeastern rim along with a fully submerged section. It measures almost eleven kilometers north to south and more than four kilometers east to west, with a total area of 36.8 square kilometers, including an 8.5 square kilometer lagoon up to 18 meters deep. Only a few sand cays rise above the water on its eastern side, the largest being East Island at just under 200 meters long, and the fringing coral reef has a wide passage on the southwest side.
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