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caverna, gruta, oca caverna, cova Höhle cave haitzulo, haizpe, harpe, hartzulo, koba, kobazulo, leize caverne, grotte cafurna, caverna, cova, espenuca, furna, gruta, pala, palafurna caverna, cueva, gruta
abismo abisme Abgrund abysm, abyss amildegi, leize, osin abime, abyss, abysse, abîme, gouffre, gueule, précipice abismo abismo, sima
  avenc, fossa Abgrund, Kluft, Spalte chasm leize, osin abime, abysse, abîme, crevasse, divergence, fossé, gouffre abismo abismo, cañón, fisura, fosa, garganta, precipicio, sima