Northwest Great Basin Ranges | Level 4 (Parent) |
         South-Central Oregon Ranges | Level 5 (Sibling) |
         Modoc-Lassen Plateau | Level 5 (Sibling) |
         Warner Mountains | Level 5 (Sibling) |
         Sheldon-Hart Mountain Refuges Area | Level 5 (Sibling) |
         Black Rock Desert Area | Level 5 (Sibling) |
         Steens Mountain Area | Level 5 (Sibling) |
         Trout Creek Area | Level 5 (Sibling) |
         Pyramid Lake Area | Level 5 (Sibling) |
         Northwest Humboldt River Area | Level 5 |
                 Slumbering Hills | Level 6 (Child) |
                 Eugene Mountains | Level 6 (Child) |
                 Antelope Range | Level 6 (Child) |
                 Majuba Mountains | Level 6 (Child) |
                 Poker Brown Mountains | Level 6 (Child) |
                 Seven Troughs Range | Level 6 (Child) |
                 Trinity Range | Level 6 (Child) |
                 Blue Wing Mountains | Level 6 (Child) |
                 Sahwave Mountains | Level 6 (Child) |
                 Nightingale Mountains | Level 6 (Child) |
         Reno-Truckee Area | Level 5 (Sibling) |