On the basis of identifying the likely geographic origins of African names extracted from the Sierra Leone Liberated African registers, this essay estimates the provenance of the transatlantic slave trade that drew on the Cameroons estuary between 1822 and 1837. The sample, drawn from six separate vessels, is broken down by age and sex category and constitutes about 7 per cent of all Africans who left from the region in these years. It makes possible analysis of changes over time, comparisons of age and sex with distance between embarkation point and likely provenance zone, as well as interaction between Old Calabar and the Cameroons regions in the supply of slaves. The great majority of the captives originated within 200 miles of the coast and within 120 miles of the modern border with Nigeria.