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. With 19,009 inhabitants per km², it is the second-smallest and most densely populated sovereign state in the world. Monaco has a land border of , 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. 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; 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 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.
How is it governed?
Monaco is a principality governed under a form of constitutional monarchy,