You know I never really noticed that the Forgotten Realms was lacking an Africa land. For some reason I always associated Chult with the South American jungles.
I'd never heard of Chult until Tomb of Annihilation. When I think of jungles and Lost Continents the first thing that pops into my head is either Central/South America or Southeast Asia, not Africa. Jurassic Park is set in Central America. The movie actually called The Lost Continent is set in the South Pacific and Skull Island from King Kong is in Southeast Asia.