Haiti, "Grotte Marie-Jeanne" in Port a Piment.
Grotte de Marie Jeanne is a large cave system located on the southwest coast of Haiti in the town of Port a Piment. It is formed on a small limestone plateau on the south central part of the Massif de la Hotte. It is potentially the largest cave system in the Caribbean, with a reported 1 kilometre of passage. However a formal survey has never been completed so the true length of the cave system is unknown.