Allzunah is a district of Ilmenau in the Thuringian Forest (Ilm district) with 27 inhabitants. Allzunah is located directly on the Rennsteig trail in the Vessertal-Thuringian Forest biosphere reserve in the Thuringian Forest. The roads from Dreiherrenstein (Neustadt/Ilmenau) to Rennsteigkreuz near Schmiedefeld (the Rennsteig) and the road from Frauenwald to Stützerbach cross in the village. Allzunah is about 775 m above sea level. Below Allzunah is the source of the Lengwitz, the source of the Ilm.