Monaco, officially the Principality of Monaco, is a sovereign city-state, country and microstate on the French Riviera in Western Europe. France borders the country on three sides while the other side borders the Mediterranean Sea. With 19,009 inhabitants per kmÂ², it is the second-smallest and most densely populated sovereign state in the world. Monaco has a land border of 5.47 km, a coastline of 3.83 km, and a width that varies between 1,700 and 349 m. The highest point in the country is a narrow pathway named Chemin des RÃ©voires on the slopes of Mont Agel, in the Les RÃ©voires Ward, which is 161 metres 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 20 percent; in 2005, it had an area of only 1.974 km2. 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 ZÃ¼rich or Geneva. Check out the video to know more about the city!