Mauritius
Tromelin

Tromelin Island lies 430 km north-west of Mauritius. Mauritius claims sovereignty over Tromelin island, though it is registered as a part of France.

The French took control of Mauritius in 1715, renaming it Isle de France. France officially ceded Mauritius including all its dependencies to Britain through the Treaty of Paris, signed on 30 May 1814 and in which Réunion was returned to France. The British Colony of Mauritius consisted of the main island of Mauritius along with its dependencies Rodrigues, Agaléga, St. Brandon, Tromelin (disputed) and the Chagos Archipelago, while the Seychelles became a separate colony in 1906. It is disputed whether the transfer of Isle de France (as Mauritius was previously known under French rule) and its dependencies to Britain in 1814 included Tromelin island. Article 8 of the Treaty of Paris stipulate the cession by France to Britain of Isle de France "and its dependencies, namely Rodrigues and the Seychelles". France considers that the sovereignty of Tromelin island was never transferred to Britain. Mauritius's claim is based on the fact that the transfer of Isle de France and its dependencies to Britain in 1814 was general in nature, that it was beyond those called out in the Treaty of Paris, and that all the dependencies of Isle de France were not specifically mentioned in the Treaty. Mauritius's claim is that since Tromelin was a dependency of Isle de France, it was 'de facto' transferred to Britain in 1814. The islands of Agaléga, St Brandon and the Chagos Archipelago were also not specifically mentioned in the Treaty of Paris but became part of the British Colony of Mauritius as they were dependencies of Isle de France at that time. In addition, the British authorities in Mauritius had been taking administrative measures with respect to Tromelin over the years; for instance, British officials granted four guano operating concessions on Tromelin island between 1901 and 1951. In 1959, British officials in 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.
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