I expected these long plains to change into mountain regions, and in fact, as the Nautilus was executing certain turns, I noticed that the southerly horizon was blocked by a high wall that seemed to close off every exit.
Je pensai que la région des montagnes allait bientôt succéder aux longues plaines, et, en effet, dans certaines évolutions du _Nautilus_, j'aperçus l'horizon méridional barré par une haute muraille qui semblait fermer toute issue.