U.S. Eco-Region Mapping
Comparisons:
Bailey
|
1st level* |
Omernik
 |
1st level |
| 3 domains |
9 level I ecoregions |
| 2nd level |
2nd level |
| 18 divisions |
17 level II ecoregions |
| 3rd level |
3rd level |
| 37 provinces |
84 level III ecoregions |
| 4th level |
4th level |
| 170 sections |
state by state |
 |
Sierra
Club
 |
1st level |
WWF/Ntl.
Geographic
|
1st level |
| 16 critical ecoregions |
11 divisions |
| 2nd level |
2nd level |
| n.a. |
119 provinces |
| |
3rd level |
| |
n.a. |
|
| *For this comparison only
the U.S. lower 48 states are tallied. |
Global Eco-Region Mapping Initiatives:
WWF Global Biomes
 |
|
URI Large Marine
Ecosystems
 |
|
|
