Definition of lower regions in English:

lower regions

plural noun

archaic
  • Hell or the underworld.

    • ‘Christ did not ascend to the higher heavens until he had descended to the lower regions.’
    • ‘Such is the story told by Herodotus; but we must do him the justice to say he expresses his disbelief of it, as well as of the same king's visit to the lower regions.’