Let's now walk along the Arsenal building, along the former Nalewki Street towards the gate of Krasinski Park. Let's stop at the commemoration of the ghetto borders. The Warsaw Ghetto was established in 1940, and was surrounded by a 3-meter high wall. The ghetto area covered one thirtieth of the Warsaw's area, and more than 400,000 people were crowded into it (in the spring of 1942 the number reached 460,000 people). In Poland, under German occupation, 600 ghettos were established: some of them were surrounded by a wall, while the borders of others were marked by street names that were not to be crossed. Ghettoization was one of many restrictions that the German occupiers began to introduce in the first weeks after entering Poland. The German ordinances affected various spheres of the Jewish community's life: from prohibitions on entering parks, cinemas, theaters or cafes, to confiscation of material goods.