Lafferty, R.A. "Entire and Perfect Chrysolite"
Summary: A group of people from the Africa of Erastothenes's world-map goes sailing and lands on the Africa of our world.
Published: In Orbit 6 (ed. Damon Knight), Putnam's 1970, Berkley 1970; Strange Doings: Stories by R.A. Lafferty, Scribner's 1972 (0684125307); The Golden Road: Great Tales of Fantasy and the Supernatural (ed. Damon Knight), Simon & Schuster 1974 (067121554X); and Lafferty in Orbit, Broken Mirrors 1991 (0962382485).
Original in: English.
Translation: German by Jo Klein as "Das absolut vollkommene Juwel", in Collection 9 (ed. Damon Knight), Fischer 1973 (3436016489).