70,000 (2011 UBB-GMIT).
Nusa Tenggara Timur Province, southwest tip, Timor island, 80 villages. Dialect locations: Kotos is central and east, Ro’is is west, Ro’is Tais Nonof is south, Ro’is Hero surrounded by Helong [heg] language area.
Kotos, Ro’is, Ro’is Hero (Kopa), Ro’is Tais Nonof. Part of Uab Meto language chain. Reportedly similar to Uab Meto [aoz] but with differences in phonology, vocabulary, and discourse, with semantic shifts, structural differences, intelligibility problems. Ro’is Tais Nonof dialect has intonation like Ro’is dialect, vocabulary like Kotos dialect.
Latin script [Latn].
Interspersed with Helong [heg]. Most literature in Kotos dialect. Christian.