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La Réunion, officially Department of La Réunion, is an island in the Indian Ocean that is an overseas department and region of France. Part of the Mascarene Islands, it is located approximately 679 km (422 mi) east of the island of Madagascar and 175 km (109 mi) southwest of the island of Mauritius. As of January 2024, it had a population of 885,700. Its capital and largest city is Saint-Denis.

La Réunion was uninhabited until French immigrants and colonial subjects settled the island in the 17th century. Its tropical climate led to the development of a plantation economy focused primarily on sugar; slaves from East Africa were imported as fieldworkers, followed by Malays, Vietnamese, Chinese, and Indians as indentured laborers. Today, the greatest proportion of the population is of mixed descent, while the predominant language is Réunion Creole, though French remains the sole official language.

Since 1946, Réunion has been governed as a French region and thus has a similar status to its counterparts in Metropolitan France. Consequently, it is one of the outermost regions of the European Union and part of the eurozone; it is, along with the French overseas department of Mayotte, one of the two eurozone areas in the Southern Hemisphere. Owing to its strategic location, France maintains a large military presence.