Corrinth
The Prelude to Dune series also establishes that the lavish capital city of Kaitain is named Corrinth.
In Dune: House Harkonnen (2000), Abulurd Harkonnen notes how the extravagant beauty of the city differs from his homeworlds of Giedi Prime and Lankiveil:
The towering government buildings of Corrinth ... rose around Abulurd Harkonnen like a drug-induced fantasy. In his wildest dreams he had never visualized so many soaring edifices, jeweled inlays, and polished slabs of precious stone ... Colorful chime kites were tethered to the tall buildings, writhing on breezes in the perpetually blue skies. Prismatic ribbons drifted across the sky and shed rainbows on the flagstones below. Kaitain was obviously more concerned with form than substance.
According to Dune: House Corrino (2001), "Hassik III ... had taxed his subjects nearly into bankruptcy in order to rebuild a governmental infrastructure. Members of the Landsraad, vowing not to be outdone by House Corrino, had built their own monuments in the growing city. Within a generation, unremarkable Kaitain had become an awesome spectacle of Imperial architecture, museums, and bureaucratic self-indulgence."
Corrinth is the location of many important structures:
Read more about this topic: Kaitain (Dune)