Auschwitz concentration camp was a network of concentration and extermination camps built and operated by the Third Reich in Polish areas annexed by Nazi Germany during World War II. It consisted of Auschwitz I (the base camp); Auschwitz II–Birkenau (the extermination camp); Auschwitz III–Monowitz (a labor camp to staff an IG Farben factory), and 45 satellite camps.
Sobibór was a Nazi German extermination camp located on the outskirts of the village of Sobibór, Lublin Voivodeship of the Nazi German General Government (occupied Poland).
Chełmno extermination camp, known by the Germans as the Kulmhof concentration camp, was a Nazi German extermination camp situated 50 kilometres (31 mi) from Łódź, near a small Polish village called Chełmno nad Nerem
Treblinka was an extermination camp, built by Nazi Germany in occupied Poland during World War II.
Belzec was the first of the Nazi German extermination camps created for the purpose of implementing the Operation Reinhard – which entailed the murder of some 2.2 million Jews, during the Holocaust.