Despite the great size of the Flanaess, only six tongues are recognized as actual languages: Flan, Suh, Ancient Baklunish, Old Oeridian, Common, and Rhopan. Rhopan is considered less important in the Flanaess than the other five. A number of dialects exist, but these are not considered languages due to their close similarity to the major languages or their limited number of speakers.
The foremost authority on languages in northeastern Oerik is Revort Leyhar at the Grey College of the University of Greyhawk. His 44-volume work, Exegesis of Linguistic Usage by the Flanaess Peoples, examines each language and dialect in paintstaking detail.