Ecoregions of lower 48 states & adjoining Canada or Mexico
See Interactive Map Below

Ecoregions are large geographic areas characterized by their climate, vegetation, geology, and other ecological and environmental patterns.

In 1996, The Nature Conservancy (TNC) adopted Conservation by Design: A Framework for Mission Success, which established a long-term conservation goal, and an ecoregional approach for planning to achieve the goal. TNC’s then goal was “the long-term survival of all viable native species and communities through the design and conservation of portfolios of sites within ecoregions.”

TNC identified and mapped 68 ecoregions (later modified to 69) in the lower 48 United States, based upon Robert Bailey’s U.S. Forest Service ECOMAP framework.

The product of ecoregional planning was a “portfolio” of conservation sites. The Conservancy hoped that the ecoregional plans would “provide a vision of conservation success, not just for The Nature Conservancy, but for the entire conservation community.”

To view Protected Areas in an ecoregion, go to Rankings and use the Filters to select an ecoregion in the spreadsheet.