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Half a million (516,841) prisoners died in camps from 1941 to 1943[3] during World War II.[citation needed] At other periods, mortality was comparatively lower.[4] The size, scope, and scale of the Gulag slave-labour camps remain subjects of much research and debate. Many Gulag camps operated in extremely remote areas of northeastern Siberia. The best-known clusters included Sevvostlag (the North-East Camps) along the Kolyma and Norillag near Norilsk, where 69,000 prisoners lived in 1952.[5] Major industrial cities of Northern Siberia, such as Norilsk and Magadan, developed from camps built by prisoners and run by former prisoners.[6]