| Location | Nigeria |
| Family | NIGER-CONGO |
| Reference | Ward, Ida C. (1933) The Phonetic and Tonal Structure of Efik. Cambridge: W. Heffer & Sons Ltd. |
| Core inventory | p,t,k,k͡p,b,d,i,u,f,s,h,e,o,m,n,ɲ,ŋ,ɔ,a,r,w,j |
| Marginal inventory | |
| Consonants | p,t,k,k͡p,b,d,f,s,h,m,n,ɲ,ŋ,r,w,j |
| Vowels | i,u,e,o,ɔ,a |
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