Arrakis (/əˈrækɨs/; 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. On April 5, 2010, a feature of Saturn's moon Titan was named Arrakis Planitia after Herbert's fictional planet.
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 the image of the desert kangaroo mouse, Muad'Dib, on it; the other moon possesses the image of 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." -Princess Irulan
Read more about Arrakis: Environment and The Spice, Plotlines, Cities and Features, Prequels