Argentina is subdivided in twenty-three provinces, and each one is ruled by a governor. The country is organized under a federal system, so each province has its own constitution. As a result, the specific characteristics of the governor office may vary at each one.
Buenos Aires is not a province, and it is not part of the eponymous Buenos Aires Province. The 1994 amendment of the Constitution of Argentina turned it into an autonomous city, with its own constitution. Buenos Aires is ruled by a mayor, who is chosen in free elections.
A governor may be removed by the national government in the case of great turmoil, or if the governor is illegally removed (for example, with a coup d'état). The President of Argentina would ask in this case for the Federal intervention of the province, which must be approved by the National Congress of Argentina. As of 2017, no province is under Federal intervention.