Friedrichshain is a part of Berlin's borough of Friedrichshain-Kreuzberg. From its creation in 1920 until Berlin's 2001 administrative reform it was a freestanding city borough. Formerly part of East Berlin, it is a inner city locality, adjacent to Mitte, Prenzlauer Berg, Kreuzberg and Lichtenberg. Friedrichshain is named after the Volkspark Friedrichshain, a vast green park located at the north border to Prenzlauer Berg. During the Nazi era, it bore the name Horst-Wessel-Stadt.