蓝洞(英语:Blue hole)是一种存在于海底的沉洞,又称为水下洞穴。世界的许多地方如伯利兹和巴哈马、红海一带等都有蓝洞。由于缺少水循环,海洋生物无法在其存活,但具有科学研究价值,目前科学家在蓝洞底部发现了许多远古化石和一些动物的残骸。最有名的蓝洞应属中美洲的大蓝洞(Great Blue Hole),其形状为一个完美的圆形,直径超过305米,深度为123米。
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