Saint-Leu is a commune located on the west coast of the island of Réunion, a French overseas department in the Indian Ocean. As part of Réunion, it is administratively part of France despite its location off the eastern coast of Africa.
The commune sits on Réunion's western coastline, which is characterized by the island's volcanic landscape. Saint-Leu serves as one of several coastal settlements on Réunion, positioning it as part of the island's network of populated areas that developed along the more accessible shoreline regions.