Alpe (Aller)

Alpe
Location of mouth in Lower Saxony
Location
Country	Germany
State	Lower Saxony
Physical characteristics
Source
• location	southwest of Dudensen
• coordinates	52°35′34″N 9°25′12″E / 52.5928833°N 09.419875°E / 52.5928833; 09.419875
• elevation	46 m above sea level (NN)
Mouth
• location	in Rethem into the Aller
• coordinates	52°47′40″N 9°21′47″E / 52.7944°N 9.3630°E / 52.7944; 9.3630
• elevation	18 m above sea level (NN)
Length	30.5 km (19.0 mi) [1]
Basin size	252 km2 (97 sq mi) [1]
Basin features
Progression	Aller→ Weser→ North Sea
Landmarks	Small towns: Rethem Villages: Dudensen, Laderholz
Tributaries
• left	Laderholzer Moorgraben, Steimbker Dorfgraben, Moorbeeke, Alpengraben, Wölpe
• right	Lutterer Bach, Neuer Eilter Graben, Schotengraben

The Alpe is a river of Lower Saxony, Germany.

The Alpe is a left tributary of the Aller. Its source lies between the villages of Dudensen and Nöpke [de; eo; nl], both within the town of Neustadt am Rübenberge. It initially crosses the Dudensen Bog and flows along the edge of the Bog Lichtenmoor [ceb; de] and past Rethem Bog. In the 1970s it lost its natural character, it was straightened and, in places, canalised. The Steimbker Dorfgraben, a drainage ditch joining it from the left, is very heavily polluted (water quality class III–IV). The Alpe itself has a good overall water quality (class II = moderately polluted).^[2] Before the town of Rethem the Weiße Graben ("White Ditch") joins the Alpe along with the Wölpe. In Rethem the Alpe then discharges into the Aller.