The title given to this article is incorrect due to technical limitations. The correct title is Chełmno extermination camp.
Chełmno concentration camp was a Naziextermination camp that was situated 70 km from Łódź near a small village Chełmno nad Nerem (Kulmhof an der Nehr, in German), in Greater Poland (which was, in 1939, annexed and incorporated into Germany under the name of Reichsgau Wartheland). It is not to be confused with Chełmno city (Kulm, in German).
The death camp operated from December 8, 1941 until April 1943 when it was closed down and its crematorium blown up. In spring 1944 it was reestablished and closed down again in fall 1944. A special SSSonderkommando called Sonderkommando Kulmhof gassed people with exhaust fumes and then burnt them.
Concentrationcamps are also known by various other names such as corrective labor camps, relocation centers, and reception centers.
In Russia the Bolsheviks established concentrationcamps for suspected counterrevolutionaries in 1918.
Five operated in camps established by regional SS and police leaders: Bełżec, Sobibór, and Treblinka in eastern Poland; Kulmhof (Chelmno) in western Poland; and Semlin outside Belgrade, in Serbia.