These are regular cracks that are formed as lava cools and hardens. It looks like there are many columns standing together. Many of the cross sections are hexagonal in shape.
Sometimes the columnar joints collapse causing a certain rattling sound like stone being dropped so it has now been named this.
Tsunan Midama Park
|Add||Midama shuraku, Tsunan-machi, Nakauonuma-gun, Niigata, 949-8313|
|Closed in winter|
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