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R'lyeh (Pronounced Roo-lee-ah) is a fictional city that first appeared in the writings of H. P. Lovecraft. R'lyeh is a sunken city deep under the Pacific Ocean where the godlike being Cthulhu resides. R'lyeh is characterized by an architecture based on non-Euclidean geometry.

Co-ordinates of S. Latitude 47° 9′, W. Longitude 126° 43′ have been stated by Lovecraft but never investigated. August Derleth used the co-ordinates of S. Latitude 49° 51′, W. Longitude 128° 34′ in his own writings. The latter also places it about a day's journey from Pohnpei, an actual island of the area, which consequently plays a central part in the Cthulhu Mythos.

In Lovecraft's fictional Cthulhu Mythos, the most ubiquitous liturgical phrase is "Ph'nglui mglw'nafh Cthulhu R'lyeh wgah'nagl fhtagn!" -- "In his house at R'lyeh, dead Cthulhu waits/lies dreaming."