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The MNRG region extends over 12 Midwestern states and includes 13 major watersheds plus the Great Lakes.
Overview map of MNRG watersheds (printable map, PDF, 2pp, 356K)

| Legend | |
|---|---|
| Detroit-St. Clair River watershed | |
| Fox River-Green Bay watershed | |
| Great Lakes watershed | |
| Illinois River watershed | |
| Minnesota River watershed | |
| Missouri River watershed (inside MNRG) | |
| Missouri River waterhsed (outside MNRG) | |
| Ohio River watershed (inside MNRG) | |
| Ohio River watershed (outside MNRG) | |
| Ozark Plateau watershed (inside MNRG) | |
| Ozark Plateau watershed (outside MNRG) | |
| Saginaw River-Bay watershed | |
| Saint Croix watershed | |
| Southern Lake Erie watershed | |
| Southern Lake Michigan Crescent watershed | |
| Upper Mississippi River watershed | |