Caladan is the third planet of Delta Pavonis. It has been recognized as the homeworld of House Atreides for twenty six generations.
Caladan is an ocean world covered with islands. It rains on Caladan periodicly. The skies are always cloudy.
Caladan is noted for seafood production, with massive creature processing factories on some islands. Caladan is the chief export of the crop, Pundi Rice.
When the House of Atreides took control of Arrakis, Caladan was still under their rule. When the Duke was killed, and Paul and Jessica were thought to be killed, House Harkonnen took Arrakis and Count Fenring of House Fenring took control of Caladan.