Yoroidake is a mountain with the columnar joint in Nara. The columnar joint is a hexagonal rock that contracted when magma cools and consolidates. It is a trace of a former volcanic activity. Yoroidake is a mountain in Nara Prefecture with an elevation of 894 meters. Its name derives from the columnar jointed rock surface on its southern face, which resembles the lacing of armor, and the mountain's shape, which evokes the image of an armored warrior.
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