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I'm starting to think this must be a typing error (and that the word should be citerne) - it looks like the name of a staircase, but the last part of the sentence is confusing as it appears to be fed by canals which have been cut out of the sandstone -
il reste des salles voûtées aux fenêtres ogivales, des escaliers taillés dans le roc comme la citgerne alimentée par de nombreux canaux creusés dans le grès