## Coral Atoll, Pratas Island, South China Sea

The circular blue band, almost 25km across, is the mostly submerged coral atoll of Pratas (Dongsha Qundao), China. Waves are breaking around its outer perimeter. The darker the blue, the deeper the water. The small area in red is the exposed part of the reef under vegetation with a sandy beach round most of it. An airstrip is visible. Waves approach the atoll from the east.
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