“Sudan, still at it.”
Libya.
Perhaps the greatest slaver of all time — Zubair Pasha — operated in and from a major zariba (thornbush enclave) found in the south Sudan. He kept Egypt’s slave markets filled with tens of thousands of southern captives throughout much of the 19th century.
Pakistan, too, I think. Just about all of the countries that recently banned are really still doing it on the sly. I have an old VHS tape about it.