Iya Valley
Japan's deepest gorge — a remote mountain valley where the Iya River has cut 200m through limestone. Samurai from the defeated Heike clan fled here in 1185 and rebuilt a civilization in the cliffs.
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The vine suspension bridges (kazurabashi) bounce noticeably as you cross — hold the handrails. The valley is so steep and narrow that sunlight only reaches the river for a few hours each day. Combine the vine bridge with the Ochiai Village viewpoint (one of Japan's most dramatic traditional settlements on a near-vertical slope) and Oboke Gorge boat tour for a full day.
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Kazurabashi Vine Bridge
A 45m suspension bridge made entirely of wild vine stems (shirakuchi kazura), rebuilt every three years. Originally built by Heike clan refugees to enable cutting if pursued — you feel the vine gaps underfoot.