70,000 (2011 Unit Bahasa dan Budaya - Gereja Masehi Injili di Timor (UBB-GMIT)).
Nusa Tenggara Timur Province, southwest tip, Timor island, Kupang regency; on Timur sea near Benini point east to Ela point, interior as far north as Oesa town: 80 villages. Dialect locations: Kotos is central and east, Ro’is is west, Ro’is Tais Nonof is south, Ro’is Hero near Kota Kupang.
Kotos, Ro’is, Ro’is Tais Nonof, Ro’is Hero (Kopa). 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.