Chult was located at the westernmost end of the Chultan peninsula, in the southern part of the Trackless Sea, off the coast of Calimshan.

As a result of the Spellplague, Chult was cut off from the mainland, becoming an island during much of the 15th century DR, but following the Second Sundering it was reunited with the mainland. Regardless, Chult had always been remote and isolated owing to its tall mountains and dense jungles full of savage beasts, massive dinosaurs, and debilitating disease. Nevertheless, Chult was also a land of great riches that never failed to draw adventurers.

 “ The world is a labyrinth, and the true followers of Ubtao know the pattern that represents their life. When they die, they must recreate that maze, spell out their past for me. To be a paladin of Ubtao, a bara of Mezro, you must know more. You must complete the maze long before you die, look ahead to the pattern that will be your life in the years and decades to come. ” — Ubtao to Artus Cimber

https://forgottenrealms.fandom.com/wiki/Chult