Akamaru is the third largest island in the Gambier Islands of French Polynesia. It is a small, rocky island with an area of approximately 2.6 km2 (1.0 sq mi). The island is located approximately 7 km (4.3 mi) southeast of Mangareva, at 23°10′52″S134°54′56″W / 23.18111°S 134.91556°W / -23.18111; -134.91556. Its highest point rises to an elevation of 247 m (810 ft).
The first European to arrive was the navigator James Wilson in 1797. In 1834, the French missionary Honoré Laval celebrated the first Mass on the island. The church of Notre-Dame de la Paix was built between 1835 and 1862. People from Mangareva sometimes visit to maintain the church and pick oranges in season. Three families comprising 11 persons live on the island, next to the church.
The much smaller island of Mekiro is located just off (about 100 m) Akamaru's northwestern shore.
The Gambier Islands or Mangareva Islands (French: Îles Gambier or Archipel des Gambier) are a small group of islands in French Polynesia, located at the southeast terminus of the Tuamotu archipelago. They are generally considered a separate island group from Tuamotu both because their culture and language (Mangarevan) are much more closely related to those of the Marquesas Islands, and because, while the Tuamotus comprise several chains of coralatolls, the Gambiers are of volcanic origin. Because of their proximity, the Acteon Group, and the nearby atoll of Temoe (23°20′46″S134°28′28″W / 23.34611°S 134.47444°W / -23.34611; -134.47444) are sometimes included among the Gambiers.