Ahlsburg (castle)
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| Ahlsburg | |
|---|---|
Alerdestein | |
| Stapelburg | |
  Ahlsburg  Ahlsburg | |
| Coordinates | 51°52′03″N 10°37′15″E / 51.8675°N 10.62083°E |
| Type | Hilltop castle |
| Code | DE-ST |
| Height | 483 m above sea level (NN) |
| Site information | |
| Condition | Ruined walls |
| Site history | |
| Built | First mentioned in 1357 |
The Ahlsburg or Alerdestein was an Imperial castle near Stapelburg in the present-day Harz district, in the German state of Saxony-Anhalt.
The site of the former Ahlsburg is located about 4.5 km (2.8 mi) south-southwest of Stapelburg and 4 km (2.5 mi) north-northeast of the Ecker Dam, on the northern edge of the Harz mountain range. It is situated on the eastern bank of the Ecker River, a south-eastern tributary of the Oker that forms the state border with Lower Saxony to the west. The castle stood above a narrow section of the valley, where a footbridge crossed the Ecker, on a spur with steep granite crags.