In reality, however, Minamidaito is an atoll: that is, to say, it is a geological doughnut that was formed around a volcano by coral reefs.
Over time, the surface of the volcano was worn down by the waves, leaving behind a ring of coral which, because it is a living organism, continues to grow upwards.
The largest and most famous of these islands is Okinawa, but we will start, in the next leg of our journey, with the southernmost island in the Ryukyu chain, Yonaguni.
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