Ushirojima Potholes・後島の甌穴

2015.02.18 (Wed)


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.



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