Daidarabotchi (ダイダラボッチ, Daidarabotchi) is a gigantic yōkai from Japanese mythology, sometimes said to pose as a mountain range when sleeping. He is the responsible for the Japanese geography, since he is able to move mountains and leave them wherever he wants.
Daidarabotchi's size was so great that his footprints were said to have created innumerable lakes and ponds. In one legend, a Daidarabotchi weighed Mount Fuji and Mount Tsukuba to see which was heavier. But he accidentally split Tsukuba's peak after he was finished with it. The Hitachi no Kuni Fudoki, a recording of the imperial customs in the Hitachi Province compiled in the 8th century, also told of a Daidarabotchi living on a hill west of a post office of Hiratsu Ogushi, who fed on giant clams from the beach, piling the shells on top of a hill.
- Daidarabotchi on the Wikipedia