Argentina is a federal republic of 23 provinces and one federal district, with the Autonomous City of Buenos Aires as its capital

Background

Article 1 of the Constitution states that the Argentine Nation adopts the representative republican federal form for its government.
The federal government's own country page gives the capital as the Ciudad Autónoma de Buenos Aires, the official language as español and the monetary unit as the peso.
The country is divided into 24 jurisdictions: 23 provincias and one federal district, which is the Ciudad Autónoma de Buenos Aires.
Article 129 gives the city of Buenos Aires an autonomous regime of government with its own powers of legislation and jurisdiction, and its head of government is elected directly by the people of the city.
Article 35 keeps three names official and interchangeable for the government and the territory of the provinces: Provincias Unidas del Río de la Plata, República Argentina and Confederación Argentina. The same article requires the words 'Nación Argentina' in the formation and sanction of laws.
Article 3 places the federal authorities in the city declared Capital of the Republic by a special law of Congress, after the territory has been ceded by one or more provincial legislatures.
The same government page gives the area as 3.761.274 km² and the population as 46.234.830 at the 2022 national census of population, households and housing.