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569 square perches is about one-and-four-fifths times as big as Seal Island
In other words, it's 1.8 times the size of Seal Island, and the size of Seal Island is 0.56 times that amount.
(Western Cape province, South Africa)
Seal Island, named for the tens of thousands of Cape Fur Seals that live there, measures about 320 square perches. The large number seals attract great white sharks, who circle the island in a so-called "Ring of Death."
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