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Arrakis
As depicted in David Lynch's Dune (1984)
Universe	Dune universe
Planet type	Desert
Notable locations	Arrakeen
Oceans	None
Notable races	Fremen
Created by	Frank Herbert
Genre	Science fiction

Arrakis (/əˈrækᵻs/;Arabic: الراقص‎‎, ar-rāqiṣ, "the dancer")—informally known as Dune and later called Rakis—is a fictional desert planet featured in the Dune series of novels by Frank Herbert. Herbert's first novel in the series, 1965's Dune, is popularly considered one of the greatest science fiction novels of all time, and it is sometimes cited as the best-selling science fiction novel in history.

In Dune, the planet is the home of the Fremen (Zensunni wanderers), and subsequently is the Imperial Capital of the Atreides Empire. Arrakis is the third planet orbiting the star Canopus, and it in turn is orbited by two moons, one of which has an albedo pattern resembling the desert kangaroo mouse, Muad'Dib, on it; the other moon has markings resembling a human hand.

Arrakis [...] Dune [...] wasteland of the Empire, and the most valuable planet in the universe. Because it is here—and only here—where spice is found. The spice. Without it there is no commerce in the Empire, there is no civilization. Arrakis [...] Dune [...] home of the spice, greatest of treasure in the universe. And he who controls it, controls our destiny.

A desert planet with no natural precipitation, in Dune it is established that Arrakis had been "His Imperial Majesty's Desert Botanical Testing Station" before the discovery of melange, for which it is the only natural source in the universe. Melange (or, "the spice") is the most essential and valuable commodity in the universe, as it extends life and makes safe interstellar travel possible (among other uses). The planet has no surface water bodies, but open canals called qanats are used "for carrying irrigation water under controlled conditions" through the desert. The Fremen collect water in underground reservoirs to fulfill their dream of someday terraforming the planet, and pay the Spacing Guild exorbitant fees in melange to keep the skies over Arrakis free of any satellites which might observe their efforts. As indicated by its large salt flats, Arrakis once had lakes and oceans; Lady Jessica also notes in Dune that wells drilled in the sinks and basins initially produce a "trickle" of water which soon stops, as if "something plugs it."