Guyane (French Guiana) is an overseas department/region and single territorial collectivity of France, located on the northern Atlantic coast of South America in the Guianas. Las Guayanas (The Guianas) also include the former British Guiana and Dutch Guiana. Also, small parts of Brazil and Venezuela belong to the Guyanas.
Guyane is located at the equator and covered by lush rain forest. While there are definitely caves, there is so far no underground site open for tourists.