Basay was a Formosan language spoken around modern-day Taipei in northern Taiwan by the Basay, Qauqaut, and Trobiawan peoples. Trobiawan, Linaw, and Qauqaut were other dialects (see East Formosan languages).Basay data is mostly available from Erin Asai's 1936 field notes, which were collected from an elderly Basay speaker in Shinshe, Taipei, as well as another one in Yilan who spoken the Trobiawan dialect (Li 1999).