I wasn't going to post anymore but it is important to differentiate between the several hundred concentration camps spread across occupied Europe and the few extermination camps which were established specifically to execute the genocide,principally of European Jewry. It's a distinction made by the nazis and one that several involved were keen to make in their testimony at Nuremberg,particularly if they could associate themselves with the perceived lesser of two evils.
Remember
Auschwitz-Birkenau,Chelmno,Belzec,Majdanek,Sobibor,Treblinka.
Remember also that several were dismantled and "landscaped" by the nazis because their work was done.
There may be a couple more in Belarus or Croatia which some modern historians add to this list but I don't believe Eichmann or Heydrich had them on their lists. Either way it still amounts to a small number of sites responsible for the deaths of millions of human beings. The deaths in concentration camps were,for the nazis,a bonus. It's almost incredible to type that seventy years later.
Steve