Located in the Lublin district, Belzec was initially a slave labor camp. The construction of extermination camp in Belzec began in November 1941, with the addition of three gas chambers.
Belzec camp was not very large in area. It was the first, though, Nazi camp to have stationary gas chambers. This camp was divided into two sections. One of them contained the administration buildings and reception area, while in the other part there were gas chambers. During the short existence of the camp, its camp commandant with his staff, a maximum of 30 German SS guards and between 90 and 120 Ukrainian guards were responsible for the murder of 600,000 people. The victims were mainly Jews, only a few hundred were Roma prisoners.