For example, here is part of the Wikipedia entry on the Warsaw Ghetto :
"At its height, as many as 460,000 Jews were imprisoned there,[5] in an area of 3.4 km2 (1.3 sq mi), with an average of 9.2 persons per room,[6][7] barely subsisting on meager food rations.[7] Jews were deported from the Warsaw Ghetto to Nazi concentration camps and mass-killing centers. In the summer of 1942, at least 254,000 ghetto residents were sent to the Treblinka extermination camp."
Gaza is 365 km sq. 2 million inhabitants. You do the maths.
