| Term: | Altitudinal limit of permafrost |
| Definition: | The lowest altitude at which Mountain Permafrost occurs in a given area downslope of the general Permafrost region. The altitudinal limit of Mountain Permafrost rises progressively with decreasing latitude in both hemispheres. |
| Term: | Altitudinal limit of permafrost |
| Definition: | The lowest altitude at which mountain permafrost occurs in a given highland area outside the general permafrost region |