Cape Bon

Cape Bon is a prominent headland on the northeastern coast of Tunisia, forming the southern boundary of the Strait of Sicily. In the narrative of Twenty Thousand Leagues Under the Sea, it is the geographical marker for one of the most significant underwater obstacles the Nautilus encounters during its rapid transit of the Mediterranean Sea.

Geographical and Geological Significance

As the Nautilus passed between Sicily and the coast of Tunisia, it entered the cramped space between Cape Bon and the Strait of Messina. Here, the sea bottom rises almost all at once, forming an actual ridge with only seventeen meters of water remaining above it, while the depth on either side is 170 meters. Professor Aronnax, consulting the chart, explains to Conseil that this ridge is like an actual isthmus connecting Europe to Africa. He notes that Smith's soundings prove that in the past, these two continents were genuinely connected between Cape Boeo and Cape Farina. Aronnax further observes that a similar barrier exists between Gibraltar and Ceuta, and in prehistoric times it closed off the Mediterranean completely. This geological observation leads to a discussion about the possibility of volcanic upheaval raising these barriers again, which Aronnax dismisses as unlikely, arguing that the intensity of underground forces is diminishing and the earth is cooling.

Narrative Role

The Nautilus's careful maneuvering over the ridge near Cape Bon is part of its high-speed crossing of the Mediterranean, a journey accomplished in just forty-eight hours. The ship's passage through this narrow, shallow area is a testament to Captain Nemo's skill and the Nautilus's advanced design, as it navigates a region that would be perilous for conventional vessels. The location serves as a key point in the narrative where the scientific and geographical discussions of the novel are foregrounded, contrasting the ancient, slow forces of geology with the modern, swift technology of the Nautilus.