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R'lyeh is a fictional lost city that was first mentioned in the H. P. Lovecraft short story "The Call of Cthulhu", first published in Weird Tales in February 1928. R'lyeh is a sunken city in the South Pacific and the prison of the entity called Cthulhu.
Norwegian sailor Gustaf Johansen, the narrator of one of the tales in the short story, describes the accidental discovery of the city: "a coast-line of mingled mud, ooze, and weedy Cyclopean masonry which can be nothing less than the tangible substance of earth's supreme terror—the nightmare corpse-city of R'lyeh...loathsomely redolent of spheres and dimensions apart from ours". The short story also asserts the premise that while currently trapped in R'lyeh, Cthulhu will eventually return, with worshipers often repeating the phrase Ph'nglui mglw'nafh Cthulhu R'lyeh wgah'nagl fhtagn: "In his house at R'lyeh, dead Cthulhu waits dreaming".
Lovecraft claims R'lyeh is located at (47°9′S 126°43′) in the southern Pacific Ocean. Writer August Derleth, a contemporary correspondent of Lovecraft, placed R'lyeh at 49°51′S 128°34′W. The latter coordinates place the city approximately 5,100 nautical miles from the actual island of Pohnpei (Ponape), the location of the fictional "Ponape Scripture". Both locations are close to the Pacific pole of inaccessibility (48°52.6′S 123°23.6′W), the point in the ocean farthest from any land mass.