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This image is a derivative work of the following images: File:Blank_US_Map.svg licensed with Cc-by-sa-3.0-migrated, GFDL . 2009-11-05T19:44:02Z NuclearVacuum 959x593 (91518 Bytes) minor fix from previous upload
Level III subdivides the continent into 182 smaller ecoregions; of these, 104 lie partly or wholly with the United States. [1] [3] Level IV is a further subdivision of Level III ecoregions. Level IV mapping is still underway but is complete across most of the United States.
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.
Ecoregions of North America, featuring the 50 United States, the District of Columbia and the five inhabited territories Wikipedia has articles relating to several ecoregion classification systems , defined by the conservation group World Wildlife Fund (WWF), the Commission for Environmental Cooperation (CEC), and like agencies around the world.
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.
For a region to be included on this template, a region must have one of the below: have at least two entire states, and portions of at least two others e.g., New England is only 71,998 sq mi (186,470 km 2) but has 6 states; have an area greater than the smallest listed area under criterion 1,
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