| North Sonoran Desert Ranges | Level 4 (Parent) |
|          Kofa Area | Level 5 |
|                  Dome Rock Mountains | Level 6 (Child) |
|                  Plomosa Mountains | Level 6 (Child) |
|                  New Water Mountains | Level 6 (Child) |
|                  Trigo Mountains | Level 6 (Child) |
|                  Chocolate Mountains | Level 6 (Child) |
|                  Kofa Mountains | Level 6 (Child) |
|                  Little Horn Mountains | Level 6 (Child) |
|                  Tank Mountains | Level 6 (Child) |
|                  Castle Dome Mountains | Level 6 (Child) |
|                  Muggins Mountains | Level 6 (Child) |
|          Harquahala Area | Level 5 (Sibling) |
|          Cabeza Prieta Area | Level 5 (Sibling) |
|          Organ Pipe Area | Level 5 (Sibling) |
|          Maricopa Area | Level 5 (Sibling) |
|          South Phoenix Area | Level 5 (Sibling) |
|          Baboquivari Area | Level 5 (Sibling) |
|          La Lesna Area | Level 5 (Sibling) |
|          San Luis Area | Level 5 (Sibling) |
|          West Tucson-Nogales Area | Level 5 (Sibling) |