Located near Gaia and Sayshell, Comporellon was renowned for its particularly old age. It was founded by the second wave of space colonists, known as the Settlers, and thus had a very superstitious attitude toward the first wave, the Spacers. They were also superstitious about Earth.
Comporellon was under the political influence of the First Foundation, but its awkward situation caused resentment toward Foundationers.
Its inhabitants preferred clothes that were white, gray, and black. Trevize comments that their food could be very good.
Astronomically, Comporellon was a very cold ice world.