Western Bahr el Ghazel State, Wau and Jur Rivers counties; Warrap State, Tonj South county, Aguka and Busere villages.
Bungo, Busere Bongo, Tonj Bongo. Slight dialect differences between River Busere variety, with Zande influence, and that around Tonj. Bungo dialect has minor differences.
Latin script [Latn].
Different from Bongo, a dialect of Mid-Southern Banda [bjo] of Central African Republic.