Tromelin Island is a territory of Mauritius
Tromelin Island (Île Tromelin) is a low, flat French Island in the Indian Ocean about 500 km (310 mi) north of Réunion and about 450 km (280 mi) east of Madagascar. Tromelin is administered as part of the French Southern and Antarctic Lands, a French Overseas Territory, but Mauritius claims sovereignty over the island. [...] Tromelin is administered as part of the French Southern and Antarctic Lands, a French Overseas Territory, but Mauritius claims sovereignty over the island despite its absence in the listing of the 8th article of the 1814 Paris Treaty. Indeed, the treaty does not specifically mention all the dependencies of Mauritius, which leads to uncertainty on the sovereignty of Tromelin, and the official text was the most clearly text in French. [...] It is a matter of dispute whether the building agreement transferred sovereignty of Tromelin from one to the other, and Mauritius claims the island as part of its territory, on the grounds that France did not retain its sovereignty over island in 1814, which was de facto part of the colony of Mauritius at the time of independence. Indeed, as early as 1959, even before independence, Mauritius informed the World Meteorological Organization that it considered Tromelin to be part of its territory. A co-management treaty was reached by France and Mauritius in 2010, but has not been ratified.