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Ushirojima Potholes・後島の甌穴

2015.02.18 (Wed)

後島の甌穴

These potholes (also known as giant’s kettles) are round cavities formed in rocky surfaces along the shoreline through erosion caused by crashing waves, blowing sand and pebbles, or coming into contact with other rocks in the area. Many of these rock formations can be found at the northern coast of Mount Kōki (Ushirojima) in Tomari.

甌穴とは、岩場に寄せる波により、石や砂が同じところを回り、海辺の岩と接触して浸食されてできた丸い穴のことです。泊地区甲亀山北岸(後島)には多数の甌穴を見ることができます。

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