Saint Barthélemy (SB) has long remained a linguistic enigma. This islet – home of an indigenous, mostly White population of about 3,000 – is divided into at least three linguistic zones: one whose vernacular is a French-based creole; the second, a northern French (oïl) dialect; and the third, English. Calvet, a leading French sociolinguist, and Chaudenson, an eminent French creolist, have set out to explain how, as a result of social insularity triggered by intertwined geographical and economic factors, an apparently ethnically homogeneous population, established on a 25-sq.-km. isolate, became so linguistically diverse. They also provide a brief comparative description of the French-related varieties used by this population, and an indication of its linguistic attitudes (as reflected by the testimony of teenage members of its two subcommunities).