Große Aa

Große Aa
The confluence of the Große Aa with the Ems
State	Lower Saxony, Germany
Reference no.	DE: 34
Basin features
Main source	Beginning: confluence of the Deeper Aa and Ahe east of Freren 33 m above sea level (NN)  (Deeper Aa 53 m above NN, Ahe 82 m above NN) 52°28′45″N 7°34′00″E / 52.47917°N 7.5666667°E / 52.47917; 7.5666667Coordinates: 52°28′45″N 7°34′00″E / 52.47917°N 7.5666667°E / 52.47917; 7.5666667
River mouth	south of Lingen 22 m above sea level (NN) 52°27′37″N 7°19′29″E / 52.46028°N 7.32472°E / 52.46028; 7.32472
Progression	Ems → North Sea
River system	Ems
Landmarks	Villages: Beesten, Lünne
Tributaries	Left: Schaler Aa, Bardelgraben, Moosbeeke, Giegel Aa, Linner Graben, Speller Aa Right: Reitbach, Schinken Canal, Südbach
Physical characteristics
Length	25 km

The Große Aa is a 25 km long, right, eastern tributary of the River Ems in western Lower Saxony (Germany).

It begins in the collective municipality of Freren, near the quarter of Overwater, at the confluence of the Deeper Aa and Ahe rivers. From there is flows through Lünne westwards to Hesselte, where it is joined by the Speller Aa. From there on it runs parallel to the Dortmund-Ems Canal and discharges into the Ems 6 km south of Lingen, a few metres north of the mouth of the canal after the Gleesen locks.