The Defaka (sometimes called Afakani) are a small ethnic group of south-western Nigeria, numbering fewer than a thousand people. They live in the eastern part of the Niger Delta, Rivers State, Bonny District; part of them in the Afakani quarter of Nkoroo town in close relationship with the Nkoroo people, and another part of them on the isolated island of Iwoma Nkoro, near Kono. Present neighbours of the Defaka, apart from the Nkoroo people, are: at Iwoma, the Ogoni people (speakers of Ogoni/Kana/Khana), and to the east, the Obolo. The Defaka have a less cordial relationship with these peoples than with the Nkoroo.
The Defaka language is being gradually pushed to extinction as they are shifting to the language of the Nkoroo people. At most 200 speakers of Defaka, all elderly people, are left.