The C.S. Lewis Space Trilogy novel set on Perelandra is titled Perelandra.
Published in 1943, Perelandra is the second novel in Lewis’s science-fiction trilogy. It follows Elwin Ransom after the events of Out of the Silent Planet and places him on the planet Perelandra, which is also identified with Venus.
The story presents a newly created world and a moral conflict involving temptation, obedience, and the possibility of a different history from humanity’s fall. Lewis combines planetary adventure with theological and philosophical themes.
The first book is Out of the Silent Planet, while the third is That Hideous Strength. The word “Perelandra” is therefore both the title and the name of the principal setting, making the question especially precise.