Greater Buenos Aires (Gran Buenos Aires, GBA, in Spanish) is the generic denomination to refer to the urban agglomeration comprising the autonomous city of Buenos Aires and the conurbation around it, over the province of Buenos Aires—namely the adjacent 24 partidos or municipalities—which nonetheless do not constitute a single administrative unit. The conurbation spreads to the south, west and north of Buenos Aires; to the east the River Plate serves as a natural boundary.