What is the maximum depth of permafrost?
1,5 m
15 m
150 m
1500 m
In areas of harsh winters the depth of the permafrost can be as much as 1,493 m (4,898 ft) in the northern Lena and Yana River basins. The overlying active layer that seasonally thaws is just 0.6–4 m (2.0–13 ft) thick.
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Answers by country
1,5 m
15 m
150 m
1500 m
answers
Australia
60
the Netherlands
20
Republic of Ireland
36
France
23
Poland
15408
Greece
24
Ukraine
24
Switzerland
50
Germany
712
the United Kingdom
197
India
184
Russia
23
Nigeria
20
the Philippines
31
Austria
97
the United States
392
Pakistan
27
Canada
54
Italy
18
Unknown
20