Plaza de la República (Republic Square) is a vast city square in Buenos Aires, capital of Argentina. It is located in the San Nicolás quarter, at the intersection of the city's three main arteries : Ninth of July Avenue, Corrientes Avenue, and Diagonal Norte. It derives its name and associations from a church once sited on the square, San Nicolás de Bari (demolished in the 1930s for the creation of 9th of July Avenue), where the country's national flag was hoisted for the first time.