This is a photo of the dense colonies of ancient blue coral in Oura Bay, Okinawa. The branching brown and green blue coral are densely packed, with white stony coral and yellow soft coral interspersed, and the distant reef visible through the blue water.
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Japanese version: 大浦湾の古代サンゴ（アオサンゴ・青珊瑚の群生）
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