An electronic (interactive) version of a 1995 publication by the US Forest Service (USFS), this site is based on the National Hierarchical Framework of Ecological Units, designed to provide "a standardized method for classifying, mapping, and describing ecological units" in the US. The "Ecoregions of the United States" contains three simple color maps of the United States (including Alaska, Hawaii...

The electronic (interactive) version of a 1994 publication by the US Forest Service (USFS), this companion site is based on the National Hierarchical Framework of Ecological Units, designed to provide "a standardized method for classifying, mapping, and describing ecological units" in the US. Ecological Subregions of the United States, contains the biophysical descriptions for the color-coded...

Those interested in aerial photographs, satellite images, or maps as ways to conceptualize the world, will find this site interesting, entertaining, and educational. The US Dept. of Interior offers a National Atlas of the United States, an interactive resource that allows users to view part or all of the US and overlay layers of information including natural features, political boundaries, federal...