Riverworld
Riverworld is a fictional planet and the setting for a series of science fiction books written by Philip José Farmer (1918-2009). Riverworld is an artificial environment where all humans (and pre-humans) are reconstructed. The books explore interactions of individuals from many different cultures and time periods. Its underlying theme is quasi-religious: who did this? Why? How? The motivations of alien intelligences operating under ultra-ethical motives are explored.
Works
The five novels in the series are as follows:
To Your Scattered Bodies Go (1971) - Hugo Award winner, Locus Award nominee, 1972
The Fabulous Riverboat (1971; the latter two books are now more frequently published together)
The Dark Design (1977)
The Magic Labyrinth (1980)
Gods of Riverworld (1983; later published as The Gods of Riverworld)
There are also several Riverworld short stories. The first of these appeared in Farmer's anthology:
Riverworld and Other Stories (1979) (a Farmer anthology with one Riverworld story titled "Riverworld")