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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
  avenc, fossa Abgrund, Kluft, Spalte chasm leize, osin abime, abysse, abîme, crevasse, divergence, fossé, gouffre abismo abismo, cañón, fisura, fosa, garganta, precipicio, sima
abismo abisme Abgrund abysm, abyss amildegi, leize, osin abime, abyss, abysse, abîme, gouffre, gueule, précipice abismo abismo, sima