The Allerbach is a tributary of the Warme Bode in the Harz Mountains of central Germany. It is just under long.
The source region of the "Little Allerbach" (Kleiner Allerbach) is in a boggy wood at a height of and lies about north of the level crossing on the K 1353 county road (KreisstraÃÂe) (Sorge â Elend section) with the railway line of the Trans-Harz Railway.
The source region of the "Big Allerbach" (GroÃÂer Allerbach) is on the southwest hillside of the Rauher Jakob (); it lies at a height of .
The stream flows downhill in an easterly direction.
With its confluence immediately next to the L 98 LandesstraÃÂe (Tanne â Königshütte section), the Allerbach forms the historic boundary of the Amt of Elbingerode. Even today there are numerous boundary stones left and right of the stream banks.