Caladan Caladan (also called Dan), the third planet of Delta Pavonis, is the ancestral fiefdom of House Atreides, who have ruled it for twenty-six generations, from the ancient Castle Caladan.

An ocean planet, Caladan's surface is predominantly covered with water; its climate is characterized by much precipitation and strong winds, but is tolerable enough to make special and expensive weather control measures unnecessary. Habitable land is often characterized by soft meadows, swamps, and dense forests.

The resource base of Caladan consists mainly of agriculture and biomass, with fishing and the locally grown pundi rice serving as the primary sources of sustenance for its people. Other traditional products include wine, whale fur, corals, certain gemstones, and livestock, most prominently thorses and cattle.

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