The dataset was originally issued in 2007 by the USDA Forest Service Washington Office-Ecosystem Management Coordination staff. The Forest Carbon Plan ecoregions generally follow subsection boundaries with a few exceptions. In the FCAT Version subsections 341Fa,341Fb341Fc, 341Ff, 341Fe (Eastside) were coded to the desert. Also, while most of subsection M261B went to the Klamath Province, subsection M261Bb went to the North Coast. The original data was compiled at 1:500,000 to 1:1,000,000 scales in participation with Federal and State agencies and nongovernmental partners. The polygon descriptions are presented for the delineated 190 section ecological units. Brief descriptions of the section map units provide an abstract primarily of the climate, physiographic, and geologic substrate that combine to form ecosystems with distinctive vegetation and other unique ecological characteristics. More information of this data set can be found at the FSGeoData Clearinghouse (http://fsgeodata.fs.fed.us/other_resources/ecosubregions.html). For more information, contact egis.calfire@fire.ca.gov