Monaco made a special agreement with France in 1963 in which French customs laws apply in Monaco and its territorial waters. Monaco uses the euro but is not a member of the European Union. Monaco shares a  border with France but also has about  of coastline with the Mediterranean sea. 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.