This map shows the slave trade regions as used in the slavevoyages database.
Same regions in colour, it’s good to keep in mind that the region called “Sierra Leone” is also including most of Guinea Conakry aside from the modern day country of Sierra Leone!
This map features the ethnic names for slaves (“casta” or “nacion” in Spanish) used by Alonso de Sandoval, a Spanish Jesuit who wrote one of the earliest books on African slavery in the Americas “De Instauranda Aethiopum Salute” (1627). These same names are also used in contemporary (1500’s-1700’s) documents from the Spanish Americas describing the ethnic background of slaves.
This map specifies the origins of Upper Guinean slaves exported via Cape Verde to Latin America
***(click to enlarge)
Maps showing presentday ethnic groups as well as historical states/empires during the slave trade period (1500’s-1800’s). Clicking on the pictures you can get to see them in even greater detail!
See also this blog post: Krio from Sierra Leone: Afro-diasporeans with a twist?