Autonomous communities are composed of provinces (provincias), which serve as the territorial building blocks for the former. In turn, provinces are composed of municipalities (municipios). The existence of these two subdivisions is granted and protected by the constitution, not necessarily by the Statutes of Autonomy themselves. Municipalities are granted autonomy to manage their internal affairs, and provinces are the territorial divisions designed to carry out the activities of the State.
The current fifty province structure is basedówith minor changesóon the one created in 1833 by Javier de Burgos. The communities of Asturias, Cantabria, La Rioja, the Balearic Islands, Madrid, Murcia and Navarre are counted as provinces as well, but were granted autonomy as single-provinces for historical reasons.