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(From International Herald Tribune (Herald Asahi))
In this case, it is the clear blue sea around Okinawa's Yaeyama islands, which boast more than 350 coral varieties in some of the world's most stunning reefs
Researcher Nobuo Saeki, 58, can literally lay his fingertips at the source of the problem
During a dive in July in Miyara Bay, at the mouth of the Miyaragawa river on Ishigakijima island, his worst fears were confirmed
About 500 meters off the coast, 7 to 8 meters down, Saeki found the world-renowned coral reefs covered in a layer of red, clayish soil. Some formations were buried
When he stirred up the water by hand, the sand …