The largest sand dune in the world is known as the Dune of Pyla, also called Pilat Dune, located in the Arcachon Bay area in France. It is an impressive natural formation that reaches a height of around 110 meters (360 feet) above sea level and stretches over 500 meters (1,640 feet) wide. The Dune of Pyla is a popular tourist destination, offering stunning panoramic views of the surrounding forest, the Atlantic Ocean, and the Banc d'Arguin nature reserve. Its size and beauty make it a must-visit attraction for those exploring the region.