evidence: Tromelin [edit]Tromelin Island lies 430 km north-west of Mauritius. Mauritius claims sovereignty over Tromelin island, though it is registered as a part of France. [...] 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.[20] In 1959, British officials in Mauritius informed the World Meteorological Organization that it considered Tromelin to be part of its territory.[125] A co-management treaty was reached by France and Mauritius in 2010 but has not been ratified.[126] [...] Mauritius considers the territorial sea of the Chagos Archipelago and Tromelin island as part of its exclusive economic zone.[15]