深山幽谷

しんざんゆうこく【深山幽谷】

deep mountains and deep valleys.

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しんざんゆうこく【深山幽谷】

steep mountains and deep valleys; deep mountains and dark valleys.

●深山幽谷に deep in the mountains.

●深山幽谷昼なお暗し. It's dark even at noon deep in the woods.