The first extermination camp was at Chelmno. It began large-scale routine (as opposed to experimental) gassings on 8 December 1941, using sealed vans with the carbon monoxide exhaust diverted into the vans. The total death toll at Chelmno is estimated at about 152,000-153,000 and there are only two (!) known survivors.
____
Concentration camps, originally established for political prrisoners, had been established already in March 1933. Dachau, near Munich, was the first concentration camp. It had a high death toll but it was not an extermination camp.
Sobibor extermination camp was created in 1943.
Belzec extermination camp was created in 1942.
Treblinka extermination camp was created in 1942.
Chełmno extermination camp ended in 1943.
Auschwitz I was the original Auschwitz camp, set up in May 1940, mainly for Polish political prisoners and the Polish elites. It also housed the main administrative offices for the whole complex of camps as well as the blocks where medical experiments were carried out, and execution chambers.
The extermination camp Chelmno was located near Chełmno nad Nerem; in Poland.
Auschwitz Birkenau, it acts as an death camp but it's an extermination camp.
Treblinka extermination camp
Sobibor extermination camp was created in 1943.
Belzec extermination camp was created in 1942.
Treblinka extermination camp was created in 1942.
Chełmno extermination camp ended in 1943.
Belzec extermination camp ended in 1942.
Treblinka extermination camp ended in 1943.
Chełmno extermination camp was created in 1941.
Auschwitz I was the original Auschwitz camp, set up in May 1940, mainly for Polish political prisoners and the Polish elites. It also housed the main administrative offices for the whole complex of camps as well as the blocks where medical experiments were carried out, and execution chambers.
Concentration camp and Extermination camp