Columbia Plateau | Level 3 (Parent) |
         North Columbia Plateau | Level 4 (Sibling) |
         Blue Mountains | Level 4 (Sibling) |
         Wallowa Mountains | Level 4 (Sibling) |
         Western Idaho Ranges | Level 4 (Sibling) |
         South Columbia Plateau | Level 4 |
                 Ochoco Mountains | Level 5 (Child) |
                 Aldrich Mountains | Level 5 (Child) |
                 Strawberry Mountains | Level 5 (Child) |
                 Maury Mountains | Level 5 (Child) |
                 Paulina Mountains | Level 5 (Child) |
                 Far South Columbia Plateau | Level 5 (Child) |