Region of Russia (7)

I believe the answer is:

siberia

(Other definitions for siberia that I've seen before include "Russian region in N Asia noted for harsh winters and prison camps" , "Cold spot" , "Former place of exile for a Russian" , "Russian far-east" , "Region in former USSR noted for harsh winters and notorious for prison camps" .)

I've seen this clue in The Telegraph and The Times.

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