海蚀洞是受海水的侵蚀作用所形成的一个洞穴。在岩岸地区,波浪拍击岸边的强劲压力,每平方公尺可以高达数万公斤重,再加上水中夹带的,其侵蚀作用是相当惊人的。海流与波浪一样挖蚀著海岸边的坡脚,使坡上岩石崩落,形成海蚀洞。世界最大的海蚀洞是位于新西兰南岛奥塔哥海岸的马泰纳卡洞穴(Matainaka Cave)[1][2]

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