Madeira

Madeira is a Portuguese archipelago in the Atlantic Ocean, referenced in Jules Verne's Twenty Thousand Leagues Under the Seas as one of the highest peaks of the sunken continent of Atlantis, a remnant of the cataclysm that obliterated the ancient land.

Identity and Geological Significance

Madeira is identified as one of the surviving mountaintops of Atlantis, the legendary continent that, according to Plato's dialogues Timaeus and Critias, was submerged in a single day and night of floods and earthquakes. During the Nautilus's exploration of the Atlantic depths, Professor Aronnax, standing on a submerged peak, realizes that the highest points of the lost continent—Madeira, the Azores, the Canaries, and the Cape Verde Islands—still emerge above the waves. This geological framing positions Madeira not merely as a modern island but as a monumental relic, a visible fragment of a prehistoric world that once rivaled Africa and Asia in size.

Narrative Role and Thematic Significance

Madeira functions as a key piece of evidence in the novel's revelation of Atlantis. When Captain Nemo scrawls the word "ATLANTIS" on a black basaltic rock, the narrative explicitly connects the submerged ruins beneath the Nautilus to the archipelagoes that dot the Atlantic. Madeira, along with the other island groups, serves as a tangible link between the mythical past and the observable present, confirming the reality of the cataclysm for Aronnax. The island thus embodies the novel's theme of hidden history and the power of the sea to both conceal and preserve the secrets of lost civilizations. It is a geographical marker that transforms a scientific hypothesis into a witnessed truth, deepening the mystery of the ocean's depths and the ancient world they contain.