Allerbach (Warme Bode)
The Allerbach is a left tributary of the Warme Bode, just under long, in the Harz Mountains of central Germany.
The source region of the "Little Allerbach" is in a boggy wood at a height of and lies about north of the level crossing on the K 1353 county road with the railway line of the Trans-Harz Railway.
The source region of the "Big Allerbach" is on the southwest hillside of the Rauher Jakob ; it lies at a height of.
The stream flows downhill in an easterly direction.
As far as its confluence immediately next to the L 98 Landesstraße, 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.