The Bight of Biafra, or Mafra (named after the town of Mafra in southern Portugal), between Capes Formosa and Lopez, is the most eastern part of the Gulf of Guinea; it contains the islands Fernando Po, Prince's and St Thomas's.
In the Bight of Biafra the coast forms an exception, being high and bold, with the Cameroon Mountains for background.
The sea frontier extends from the Rio del Rey, just where the great bend of the coast-line east to south begins, forming the Bight of Biafra, to the Campo river, a distance of 200 m.
Where the reptile is venerated or feared it is usually inviolable, and among the Brassmen of the Niger the dangerous and destructive cobra was especially protected by an article in the diplomatic treaty of 1856 for the Bight of Biafra (Maclennan, 524).
The name Biafra - as indicating the country - fell into disuse in the later part of the 19th century.