Treblinka (. [trɛˈblʲinka]) was an extermination camp, built by Nazi Germany in occupied Poland during World War II. It was located near the village of Treblinka north-east of Warsaw in what is now the Masovian Voivodeship.The camp operated between 23 July 1942 and 19 October 1943 as part of Operation Reinhard, the most deadly phase of the Final Solution.he second camp, Treblinka II, was an extermination camp (Vernichtungslager). A small number of men who were not killed immediately upon arrival became its Jewish slave-labour units called Sonderkommandos, forced to bury the victims' bodies in mass graves.