Depending on the location and the time of year, the depth of permafrost varies. Typically permafrost can range from 0.6 to 4 meters (2 to 12 feet) thick in most regions. However, the thickness of permafrost can reach values that are many folds greater than the general range. An example of such occurrence is the permafrost in northern Lena and Yana River basins in Siberia, measuring at 1493 meters (4510 ft) deep.
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