Haiti was a country located in the Caribbean.
The Seventh Doctor, Ace and Bernice Summerfield accidentally went there in 1915 when trying to visit Ernest Hemingway in nearby Key West, Florida. Once there, they met Francois Lacombe, a native of the Alsace region of France. While there, they prevented Mait Lemaitre from summoning Cthulhu. (PROSE: White Darkness, PROSE: All-Consuming Fire)
During or before his eighth incarnation, the Doctor witnessed a hoodoo ceremony in Haiti. (AUDIO: The Next Life)