Riung is a language of central Flores, in East Nusa Tenggara Province, Indonesia. It has sometimes been considered a dialect of Manggarai to the west, but is only marginally intelligible with it.
References
^Riung at Ethnologue (18th ed., 2015) (subscription required)
Further reading
Schmidt, Christopher K. (2013). Morphosyntax of Wangka, a Dialect of Rembong-Riung (PhD thesis). Rice University. hdl:1911/103420.