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The physiographic regions of the contiguous United States comprise 8 divisions, 25 provinces, and 85 sections. [1] The system dates to Nevin Fenneman's report Physiographic Divisions of the United States, published in 1916. [2] [3] The map was updated and republished by the Association of American Geographers in 1928. [4]
Vernacular regions reflect a "sense of place," but rarely coincide with established jurisdictional borders. [3] Examples of vernacular regions in the United States include Tidewater, also known as Hampton Roads, Siouxland, and the Tri-City area of Batavia, Geneva, and St. Charles, Illinois. Another can be the American South, since it can be non ...
U.S. Census Bureau regions and divisions. Since 1950, the United States Census Bureau defines four statistical regions, with nine divisions. [1] [2] The Census Bureau region definition is "widely used... for data collection and analysis", [3] and is the most commonly used classification system.
The term "United States," when used in the geographic sense, refers to the contiguous United States (sometimes referred to as the Lower 48, including the District of Columbia not as a state), Alaska, Hawaii, the five insular territories of Puerto Rico, Northern Mariana Islands, U.S. Virgin Islands, Guam, American Samoa, and minor outlying possessions. [1]
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Multidimensional perceptual maps are built with more dimensions visualised as profile charts in small map regions, and then items are mapped to the regions by their similarity to the vectors that represent the region. A common technique to construct this kind of multidimensional perceptual maps is the self-organizing map. This helps pinpoint ...
Ecoregions of North America, featuring the 50 United States, the District of Columbia and the five inhabited territories. The following is a list of ecoregions in the United States as identified by the World Wide Fund for Nature (WWF). The United States is a megadiverse country with a high level of endemism across a wide variety of ecosystems.
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