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In page Monaco:

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Honoré II, Prince of Monaco secured recognition of his independent sovereignty from Spain in 1633, and then from Louis XIII of France by the Treaty of Péronne (1641).[citation needed] Monaco made a special agreement with France in 1963 in which French customs laws apply in Monaco and its territorial waters.[1] Monaco uses the euro but is not a member of the European Union.[1] Monaco shares a 6 km (3.7 mi) border with France but also has about 2 km (1.2 mi) of coastline with the Mediterranean sea.[2] Two important agreements that support Monaco's independence from France include the Franco-Monégasque Treaty of 1861 and the French Treaty of 1918 (see also Kingdom of Sardinia). The United States CIA Factbook records 1419 as the year of Monaco's independence.[2]