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An endless blue
It is the deepest blue hole in the world. Nicknamed "Dragon Hole", Sansha Yongle is a sea sinkhole located in the waters of the Paracel Islands in the South China Sea. It has a diameter of 130 meters for a depth of nearly 300 meters. A blue hole is a type of rare geological phenomenon. They are usually created from caves that slowly erode and crumble over time.
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