Aukena is the 4th largest of the Gambier Islands in French Polynesia. Aukena is located at , about halfway between Mangareva and Akamaru (Island), or about 5 km (3.1 mi) southeast of Mangareva. Aukena is approximately 2.5 km (1.6 mi) long and about 0.5 km (0.31 mi) wide, with a total area of 0.9 km2 (0.35 sq mi).