Allerbach (Warme Bode)
| Location | Harz, Saxony-Anhalt,  Germany |
|---|---|
| Length | 5 km (3 mi) |
| Source | (see description) 51°43′32″N 10°40′56″E / 51.72556°N 10.68222°ECoordinates: 51°43′32″N 10°40′56″E / 51.72556°N 10.68222°E |
| Source height | ca. 560 m above sea level (NN) |
| Mouth | (see description) 51°42′50″N 10°44′28″E / 51.71389°N 10.74111°E |
| Mouth height | ca. 450 m above sea level (NN) |
| Descent | ca. 110 m |
| Basin | Elbe |
| Progression | Warme Bode → Bode → Saale → Elbe → North Sea |
| Its entire course is part of the Harzer Bachläufe nature reserve. | |
The Allerbach is a left tributary of the Warm Bode, just under 5 kilometres (3 mi) long, in the Harz Mountains of central Germany.
The source region of the "Little Allerbach" (Kleiner Allerbach) is in a boggy wood at a height of 560 m above sea level (NN) and lies about 100 metres (330 ft) north of the level crossing on the K 1353 county road (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 (560 m above NN); it lies at a height of 540 m above sea level (NN).
The stream flows downhill in an easterly direction.
As far as 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.