The Black Volta Region of Burkina Faso is in the southwest of the country.
Five sites with ancient iron mines and furnaces around Burkina Faso have been listed as a world heritage site. Two of them are in the Black Volta Region (the other three are in North Burkina Faso):
Békuy Site, 11.622392°, -3.891942°. 2019-07-06
Douroula site, 12.587753°, -3.328983°. 2019-07-06