| Term: | Permafrost region |
| Definition: |
A region in which the temperature of some or all of the ground below the seasonally freezing and thawing layer remains continuously at or below 0 degrees Celsius for at least two consecutive years. NSIDCCryosphere
A region in which the temperature of some or all of the ground below the seasonally freezing and thawing layer remains continuously at or below 0˚C for at least two consecutive years IPAPermafrost GCW |