Monaco, officially the Principality of Monaco (French: Principauté de Monaco (French pronunciation: [pʁɛ̃sipoteˈ də monakoˈ]); Monégasque: Principatu de Múnegu; Italian: Principato di Monaco; Occitan: Principat de Mónegue), is a sovereign city-state and microstate, located on the French Riviera in Western Europe. It is bordered by France on three sides; one side borders the Mediterranean Sea. Monaco has an area of 2.02 km2 (0.78 sq mi) and a population of 36,371; it is the second smallest and the most densely populated country in the world. Monaco has a land border of 4.4 km (2.7 mi), a coastline of 4.1 km (2.5 mi), and a width that varies between 1,700 and 349 m (5,577 and 1,145 ft). 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 161 metres (528 feet) above sea level. Monaco's most populous Quartier is Monte Carlo and the most populous Ward is Larvotto/Bas Moulins. Through land reclamation, Monaco's land mass has expanded by twenty percent.
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 state's sovereignty was officially recognized by the Franco-Monegasque Treaty of 1861, with Monaco becoming a full United Nations voting member in 1993. Despite Monaco's independence and separate foreign policy, its defense is the responsibility of France. However, Monaco does maintain two small military units.