Throughout German-occupied Europe, millions of Jews were deported to death camps in Poland – where they were systematically killed – and to concentration camps – for forced labor.
Transit camps (such as Westerbork, Gurs, Mechelen and Drancy) and some concentration camps (like Bolzano and Fossoli di Carpi) were used as collection centers for Jews, who were then deported by rail to the extermination camps.
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https://www.jewishvirtuallibrary.org/jsource/Holocaust/campmap.html