Based on present day national boudaries:
The largest in number & size were in Poland & Germany. Rest were in France (Natzweiler), Netherlands (Westerbork), Austria (Mauthausen), Czechoslovakia (Theresienstadt & Sered), Latvia (Kaiserwald), Belarus (Koldichevo) & the Ukraine (Janowska).
In World War 1 (1914-18) there were no concentration camps. For the Nazi concentration camps, see the related question.
By 1944 Nazi had 13 main concentration camps and over 500 satellite camps. The concentration camps were not just to murder people but also for free slave labor.
concentration camps
world war 2
World war 2
Concentration Camps Transit Camps Labour Camps Death Camps Extermination Camps.
Auschwitz, which consisted of three camps on the main site and a further 45 sub-camps.
Their was only about 20 Major concentration camps.
Why did Adolf create concentration camps?
concentration camps were places where Jews were kept in the 2nd world war and then the used to get killed there
The Allies liberated many Nazi and Axis concentration camps in World War Two.The prisoners of war were sent to concentration camps.
They were put in concentration camps and extermination camps.