Twenty Thousand Leagues Under the Sea: A Tour of the Underwater World (French: Vingt mille lieues sous les mers: Tour du monde sous-marin, "Twenty Thousand Leagues Under the Seas: A Tour of the Underwater World") is a classic science fiction adventure novel by French writer Jules Verne published in 1870.

The book was highly acclaimed when it was released and still is; it is regarded as one of the premiere adventure novels and one of Verne's greatest works, along with Around the World in Eighty Days and Journey to the Center of the Earth. The description of Nemo's ship, the Nautilus, was considered ahead of its time, as it accurately describes features on submarines, which at the time were very primitive vessels.

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