Do you know that there are several submarine optical cable entrances in China, where they are connected respectively, or what is the distribution of submarine optical cables around the world? You can query through this global submarine optical cable distribution map, which is developed through the combination of Google map and Wikipedia data. You can intuitively see that several submarine optical cable entrances in China are in Qingdao, Yangtze River Delta, Pearl River Delta and Shantou.
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