The Allerbach is a

tributary A tributary, or an ''affluent'', is a stream or river that flows into a larger stream (''main stem'' or ''"parent"''), river, or a lake. A tributary does not flow directly into a sea or ocean. Tributaries, and the main stem river into which they ...

of the

Warme Bode The Warme Bode is the right-hand headstream of the Bode (river), Bode in the High Harz mountains of central Germany in the states of Lower Saxony and Saxony-Anhalt. It is long and is formed by the confluence of the Große Bode and Kleine Bode riv ...

in the

Harz Mountains The Harz (), also called the Harz Mountains, is a Mittelgebirge, highland area in northern Germany. It has the highest elevations for that region, and its rugged terrain extends across parts of Lower Saxony, Saxony-Anhalt, and Thuringia. The nam ...

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 (''

Kreisstraße A Kreisstraße (, or 'county road') is a class of road in Germany. It carries traffic between the towns and villages within a ''Districts of Germany, Kreis'' or district or between two neighbouring districts. In importance, the ''Kreisstraße'' ...

'') ( Sorge – Elend section) with the railway line of the Trans-Harz Railway. The source region of the "Big Allerbach" (''Großer Allerbach'') is on the southwest hillside of the Rauher Jakob (); it lies at a height of . The stream flows downhill in an easterly direction. Regarding its confluence immediately next to the L 98 ''Landesstraße'' ( Tanne – 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.

See also