vatawi (used by about 6000 people) is spoken in five villages in the north of the dida territory (Ivory Coast), itself an integral part of the kru block (eastern sub-group). This description of the language, resulting from fieldwork, comprises a phonology (phonemes, tones, distribution), a grammar (inventory of categories, syntax, synthematics), the presentation of a series of oral texts, and a lexicon. The especial interest of vatawi lies in the structure of its vocal system, contrasting 'bright' and 'breathy' vowels, the existence of a tonal system of four register pitches, with many modulations, the advanced nature of the systems of nominal and verbal modifiers (aspects). The syntax is essentially positional, but benefits from a rich set of function markers. The language has a composition, nominal and verbal (incorporation). The theoretic point of view is functionalist and refers to the work of André Martinet.