In Uruguay, the slaves came from the coastal area extending from Sudan to Mozambique (except Cape Town). This can be determined based on the 'nations' that
[...] although not an accurate reference, since they sometimes corresponded to geographical expressions and not ethnic groups, confirmed the places of origin of the eastern blacks and, above all, the predominance of Bantus over Sudanese (Pereda Valdés, 1965, p. 17).  
The same author points out that many slaves arrived in Montevideo from Brazil and argues that the large number of black people brought directly from Brazil proves, in itself, the dual precedence of individuals of Bantu and Sudanese origin among black Uruguayans (Pereda Valdés, 1965, p. 16). This author also claims that slaves from Senegal, Guinea, Mozambique and Sierra Leone were brought to Uruguay from Buenos Aires.