Monaco, officially the Principality of Monaco, is a sovereign city-state and microstate on the French Riviera a few kilometres west of the Italian region of Liguria, in Western Europe, on the Mediterranean Sea. It is bordered by France to the north, east and west. The principality is home to 38,682 residents, of whom 9,486 are Monégasque nationals; it is widely recognised as one of the most expensive and wealthiest places in the world. The official language of the principality is French. In addition, Monégasque (a dialect of Ligurian), Italian and English are spoken and understood by many residents.

With an area of 2.1 km2 (0.81 sq mi), it is the second-smallest sovereign state in the world, after Vatican City. Its 19,009 inhabitants /km2 (49,230/sq mi) make it the most densely-populated sovereign state in the world. Monaco has a land border of 5.47 km (3.40 mi) and the world's shortest coastline of approximately 3.83 km (2.38 mi); it has a width that varies between 1,700 and 349 m (5,577 and 1,145 ft). The highest point in the state is a narrow pathway named Chemin des Révoires on the slopes of Mont Agel, in the Les Révoires ward, which is 161 m (528 ft) above sea level. The principality is about 15 km (9.3 mi) from the border with Italy. Its most populous ward is Larvotto/Bas Moulins with a population of 5,443 as of 2008. Through land reclamation, Monaco's land mass has expanded by 20 percent. In 2005, it had an area of only 1.974 km2 (0.762 sq mi).

The principality is governed under a form of constitutional monarchy, with Prince Albert II as head of state, who wields immense political power despite his constitutional status. The prime minister, who is the head of government, can be either a Monégasque or a French citizen.

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