請連勝文做點功課: 社子島並不是島。此區域應該稱為Allvial deposit. 而島的分類幾本上有 islet, island, peninsular 及archipelago. 

sandbank 
A ridge of sand along a shore that is partially or totally submerged and thus a hazard to shipping.

alluvial deposit. / Alluvium⋯⋯ 更多
Alluvium - Wikipedia, the free encyclopedia
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Alluvium (from the Latin, alluvius, from alluere, "to wash against") is loose, unconsolidated (not cemented together into a solid rock) soil or sediments, which has been...
 
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