From the 1920s to the end of the 1950s, there were altogether between 400 and 500 gulags in the Soviet Union. About 14 million prisoners are estimated to have been sent to these GULAG labor camps. Roughly estimated, close to 3 million people died in the camps.
Find some major locations of those GULAG camps. Some were notified for their concentration of prisoners, some for historical reasons, and some for their infamous living and working conditions.