Sudan and South Sudan have multiple regional sign languages, which are not

mutually intelligible In linguistics, mutual intelligibility is a relationship between different but related language varieties in which speakers of the different varieties can readily understand each other without prior familiarity or special effort. Mutual intellig ...

. A survey of just three states found 150 sign languages, though this number included instances of

home sign Home sign (or kitchen sign) is a gestural communication system, often invented spontaneously by a Deafness, deaf child who lacks accessible linguistic input. Home sign systems often arise in families where a deaf child is raised by hearing parent ...

. Government figures estimate there are at least about 48,900 deaf people in Sudan. By 2009, the Sudanese National Union of the Deaf had worked out a Unified Sudanese Sign Language, but it had not yet been widely disseminated.

References

Sign language isolates Languages of Sudan Languages of South Sudan Disability in Sudan Disability in South Sudan Language isolates of Africa {{sign-lang-stub