Krummbach (Dreisam)

Krummbach
The upper Zastler valley seen from the Feldberg
Location	Baden-Württemberg, Germany
Reference no.	DE: 2338832
Basin features
Main source	Into the Zastler Loch at Feldberg ca. 1,445 m above sea level (NN) 47°52′27″N 8°00′52″E / 47.87406°N 8.01442°E / 47.87406; 8.01442Coordinates: 47°52′27″N 8°00′52″E / 47.87406°N 8.01442°E / 47.87406; 8.01442
River mouth	into the Dreisam ca. 329 m above sea level (NN) 47°58′48″N 7°55′05″E / 47.98008°N 7.91807°E / 47.98008; 7.91807
Progression	Dreisam → Elz → Rhine → North Sea
River system	Rhine
Basin size	30.99 km²
Landmarks	Villages: Oberried, Kirchzarten
Tributaries	Left: Stollenbach Right: Weilersbächle
Physical characteristics
Length	16.89 km
Discharge	Location: at its mouth Average rate: 1.0 m³/s

The Krummbach is a left tributary of the Dreisam in the Southern Black Forest east of Freiburg im Breisgau in the German state of Baden-Württemberg. It is just under 17 kilometres long, In its upper reaches it is better known as the Zastlerbach; in its middle course it is also known as the Osterbach.