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In page Human rights in North Korea:

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The internment camps are located in central and northeastern North Korea. They comprise many prison labor colonies in secluded mountain valleys, completely isolated from the outside world.[3][4] The total number of prisoners is estimated to be 80,000 to 120,000.[5] The Yodok and Bukchang camps are separated into two sections: one for political prisoners in lifelong detention, the other similar to re-education camps where prisoners are serving long-term sentences with the vague hope that they will eventually be released.[citation needed]