Monaco, officially the Principality of Monaco, is a sovereign city-state, country and microstate, located on the French Riviera in Western Europe. France borders the country on three sides while the other side borders the Mediterranean Sea. Monaco has an area of and a population of about 38,400 according to the last census of 2016. a coastline of, and a width that varies between. The highest point in the country is a narrow pathway named Chemin des Révoires on the slopes of Mont Agel, in the Les Révoires Ward, which is above sea level. Monacos most populous Quartier is Monte Carlo and the most populous Ward is Larvotto/Bas Moulins. Through land reclamation, Monacos land mass has expanded by twenty percent; in 2005, it had an area of only. Monaco is known as a playground for the rich and famous, due to its tax laws. In 2014, it was noted about 30% of the population was made up of millionaires, more than in Zürich or Geneva. Monaco is a principality governed under a form of constitutional monarchy, with Prince Albert II as head of state. Although Prince Albert II is a constitutional monarch, he wields immense political power. The House of Grimaldi have ruled Monaco, with brief interruptions, since 1297. The official language is French, but Monégasque, Italian, and English are widely spoken and understood. The states sovereignty was officially recognized by the Franco-Monegasque Treaty of 1861, with Monaco becoming a full United Nations voting member in 1993. Despite Monacos independence and separate foreign policy, its defense is the responsibility of France. However, Monaco does maintain two small military units. Economic development was spurred in the late 19th century with the opening of the countrys first casino, Monte Carlo, and a railway connection to Paris. Since then, Monacos mild climate, scenery, and gambling facilities have contributed to the principalitys status as a tourist destination and recreation center for the rich. In more recent years, Monaco has become a major banking center and has sought to diversify its economy into services and small, high-value-added, non-polluting industries. The state has no income tax, low business taxes, and is well known for being a tax haven. It is also the host of the annual street circuit motor race Monaco Grand Prix, one of the original Grands Prix of Formula One. Monaco is not formally a part of the European Union, but it participates in certain EU policies, including customs and border controls. Through its relationship with France, Monaco uses the euro as its sole currency. Monaco joined the Council of Europe in 2004. It is a member of the Organisation Internationale de la Francophonie .