JMdict: 1438960

天険 【てんけん】

  1. [n] natural defences; natural defenses; steep place
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Kanji in this word:

Kanji Meanings On Readings Kun Readings
天 Heavens, Sky, Imperial テン あまつ, あめ, あま-
険 Precipitous, Inaccessible Place, Impregnable Position, Steep Place, Sharp Eyes ケン けわ.しい