| Appalachian Plateaus | Level 3 (Parent) |
|          Allegheny Plateau | Level 4 |
|                  Northern Allegheny Plateau | Level 5 (Child) |
|                  Finger Lakes | Level 5 (Child) |
|                  Northeastern Pennsylvania | Level 5 (Child) |
|                  Pocono Plateau | Level 5 (Child) |
|                  Southern Allegheny Plateau | Level 5 (Child) |
|          Catskill Mountains | Level 4 (Sibling) |
|          Allegheny Mountains | Level 4 (Sibling) |
|          Cumberland Plateau | Level 4 (Sibling) |
|          Cumberland Mountains | Level 4 (Sibling) |