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Administrative divisions (also administrative units, administrative regions, subnational entities, or constituent states, as well as many similar generic terms) are geographical areas into which a particular independent sovereign state is divided. Such a unit usually has an administrative authority with the power to take administrative or policy decisions for its area. Administrative divisions are often used as polygons in geospatial analysis.
The levels of administrative divisions and their structure largely varies by country (and sometimes within a single country). Usually the smaller the country is (by area or population), the fewer levels of administrative divisions it has. For example, Vatican City does not have any administrative subdivisions, and Monaco has only one level (both are city-states), while such countries as France and Pakistan have five levels each. The United States is composed of states, possessions, Territory, and a federal district, each with varying numbers of subdivisions.
The principal administrative division of a country is sometimes called the " first-level (or first-order) administrative division" or "first administrative level". Its next subdivision might be called "second-level administrative division" or "second administrative level" and so on. An alternative terminology is provided by the Nomenclature of Territorial Units for Statistics which terms the principal division as the second level or NUTS-2.
Communities united in a federation under a federal government are more specifically known as . A federated state may be referred to as a province, region, canton, land, governorate, oblast, emirate, or country. The Australian National Dictionary: Fourth Edition, pg 1395. (2004) Canberra. . California . Encyclopædia Britannica. Accessed 2009-11-01. Administrative units that are not federated or confederated but enjoy a greater degree of autonomy or self-government than other territories within the same country can be considered autonomous regions or de facto constituent states of that country. This relationship is by some authors called a federacy or asymmetric federalism. An example is the autonomous republic of Karakalpakstan within Uzbekistan. International Covenant On Civil And Political Rights , p 5. United Nations Human Rights Committee. Accessed 2009-11-01.
In the realm of self-government, any of these can and does occur along a stretch of road—which for the most part is passing through rural, unsettled countryside. Since the terms are administrative political divisions of the local regional government, their exact relationship and definitions are subject to home rule considerations, tradition, as well as state statute law and local governmental (administrative) definition and control. In British cultural legacy, some territorial entities began with fairly expansive counties which encompass an appreciably large area, but were divided over time into a number of smaller entities.
Within those entities are the large and small cities or towns, which may or may not be the county seat. Some of the world's larger cities culturally, if not officially, span several counties, and those crossing state or provincial boundaries have much in common culturally as well, but are rarely incorporated within the same municipal government. Many sister cities share a water boundary, which quite often serves as a border of both cities and counties. For example, Cambridge and Boston, Massachusetts appear to the casual traveler as one large city, while locally they each are quite culturally different and occupy different counties.
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