Harmonthep was a planet orbiting the star Delta Pavonis. Caladan was also in the same star system. Harmonthep was a swampy world with a nitrogen-oxygen atmosphere. It was also rich in biological life. Consequently, it was also capable of accommodating human life, and for a while was the home of a population of Zensunni. Inglsey noted Harmonthep as the sixth stop in the Wanderers' migration. Harmonthep was remembered as one of the origins of the Fremen. It was eventually totally destroyed.