Caladan was the third planet orbiting the star Delta Pavonis. It was a lush oceanic world, and the ancestral home of House Atreides for twenty-six generations, prior to their relocation to the planet Arrakis in 10191 AG Rain also appeared to be a common feature of the planet's meteorology. The land was also broken by rivers and mountains. The planet hosted a diverse and complex underwater ecosystem, and presumably an equally rich and complex biology of the land.