Arrakis, also known as "Dune", and later "Rakis" after the fall of God-Emperor Leto II, was a harsh desert planet located on the far edge of the Old Imperium in the Canopus star system. It later became the Imperium's center under Muad'Dib's empire. It was the original and for a long time sole source of the Spice Melange, which was vitally important for space travel.