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Erft in Bergheim.jpg
Lower reaches of the Erft near Bergheim
Location North Rhine-Westphalia,  Germany
Reference no. DE: 274
Length 106.6 km  (incl. Kuhbach)[1]
Source Southeast of Engelgau as the Kuhbach
Signed source of the Erft near Holzmülheim
50°29′14″N 6°35′14″E / 50.48722°N 6.58722°E / 50.48722; 6.58722Coordinates: 50°29′14″N 6°35′14″E / 50.48722°N 6.58722°E / 50.48722; 6.58722
Source height 527 m above sea level (NHN)
Mouth Rhine near Neuss-Grimlinghausen
51°11′04″N 6°43′54″E / 51.18444°N 6.73167°E / 51.18444; 6.73167
Mouth height 31 m above sea level (NHN)
Descent 496 m
Basin Rhine
Progression Rhine → North Sea
Catchment 1,837.915 km² [1]
at Neubrück gauge[2]
Record low:     5.15 m³/s (in 16.07.2007)
Average low:    10.4 m³/s
Average mid:   16.4 m³/s
Average high: 31.3 m³/s
Record high:   46.6 m³/s (in 04.06.1984)
Right tributaries Swist, Gillbach, Norfbach
Left tributaries Veybach, Rotbach, Neffelbach
Cities Neuss
Large towns Euskirchen, Erftstadt, Bedburg, Bergheim, Grevenbroich, Kerpen
Small towns Bad Münstereifel
Erftquelle 2009.jpg
Source of the Erft near Holzmülheim
Erft Grevenbroich.jpg
The Erft near Grevenbroich

The Erft (pronounced [ʔɛɐ̯ft]) is a river in North Rhine-Westphalia, Germany. It flows through the foothills of the Eifel, and joins the Lower Rhine (left tributary). Its origin is near Nettersheim, and its mouth in Neuss-Grimlinghausen south of the Josef Cardinal Frings Bridge. The river is 103 kilometres (64 mi) long, which is significantly shorter than it was originally. Due to the open-pit mining of lignite in the Hambacher Loch, the flow of the river had to be changed.

The Erft gave its name to the town of Erftstadt, through which it flows, as well as to the Rhein-Erft district. It also flows through the towns of Bad Münstereifel, Euskirchen, Bergheim, Bedburg and Grevenbroich.