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Fuji-Hakone-Izu NP, Tokyo
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Fudoike’s famous heart is a temporary shape: its outline changes as the water level rises and falls, and after too little rain the pond can shrink until the heart disappears. The view depends on the weather.
Though it is called Fudoike, the pond’s tiny island shrine honors Ryūjin, the dragon deity. Nearby, separate small shrines honor Fudō and Dainichi—a surprising meeting of sacred figures beside one pond.
Island fishermen once revered Fudoike, and local tradition still sets a boundary: don’t approach the shrine or peer inside. The Environment Ministry likewise warns visitors to keep away from the old bridge to its islet.