Thalassian is the primary language of blood elves and high elves. It has both written and spoken equivalents. Individuals who are unfamiliar with the language's proper name may refer to it as High Elven.
Like Nazja, Thalassian is derived from the Darnassian language. Hence, Thalassian is closely related to Darnassian, and there is some overlap between the two languages. Further Darnassian utterances may therefore have been preserved in modern Thalassian