R'lyea is the great and ancient underwater city (more of a tomb) where Cthulhu lies dreaming. The great spell 'Ia' R'lyea! Cthulhu fhtagn! Ia'! Ia' speaks of both the city of 'R'lyea' and the elder god.
Behind the scenesEdit
In Lovecraft works R'lyeh is a city of non-Euclidean geometrical design. It is misspelled (possibly intentionally) in the King's Quest Companion.