Arguin (Portuguese: Arguim) is an island off the western coast of Mauritania in the Bay of Arguin. It is approximately 6x2 km in size, with extensive and dangerous reefs around it. The island is now part of the Banc d'Arguin National Park.
The island changed hands frequently during the colonial era. The first European to visit the island was the Portuguese explorer Nuno Tristão, in 1443. In 1445, Prince Henry the Navigator set up a trading post on the island, which acquired gum arabic and slaves for Portugal. By 1455, 800 slaves were shipped from Arguin to Portugal every year.
In 1633, during its war against Spain (which then controlled Portugal), the Netherlands seized control of Arguin. It remained under Dutch rule until 1678, with a brief interruption by English rule in 1665. France took over the island in September 1678, but it was then abandoned until 1685. Arguin's aridity and its lack of a good anchorage made long-term European settlement difficult.
In 1685 Captain Reers of the frigate Rother Löwe occupied the old Portuguese fort on the island. He successfully concluded a treaty with the native king in which Brandenburg was accepted as a protecting power. The treaty was ratified in 1687 and was renewed in 1698. Arguin remained a colony of Brandenburg until 1721 when the French successfully assaulted the fort and then took control of the island. The Dutch took the fort and island from the French the following year only to lose it again in 1724 to the French. This period of French rule lasted four years; in 1728, it reverted to the control of indigenous peoples. The island was included in the territory of the French colony of Mauritania, and it remained under Mauritanian rule when that country became independent in 1960.
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