70,000 (2011 UBB-GMIT).
East Nusa Tenggara 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. 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.
Some also use Indonesian [<a href=show_language.asp?code=ind>ind</a>].
Interspersed with Helong [heg]. Most literature in Kotos dialect. Christian.