Westerwolder Aa

from Wikipedia, the free encyclopedia
Westerwolder Aa,
Westerwoldsche Aa, Westerwoldse Aa
Westerwoldsche Aa near Nieuweschans

Westerwoldsche Aa near Nieuweschans

location Groningen Province
River system Ems
Drain over Unterems  → North Sea
Origin of the Ruiten-Aa Ter Apel in the municipality of Vlagtwedde , The Netherlands
52 ° 52 ′ 13 ″  N , 7 ° 5 ′ 12 ″  E
Source height 10  m above sea level NN
muzzle in the Dollart coordinates: 53 ° 14 ′ 11 "  N , 7 ° 12 ′ 22"  E 53 ° 14 ′ 11 "  N , 7 ° 12 ′ 22"  E
Mouth height m above sea level NN
Height difference 10 m

Small towns Nieuweschans
Communities Vlagtwedde , Bellingwedde , Oldambt
From the Nieuweschans border river between Germany and the Netherlands

The Westerwolder Aa , also mostly recorded in German maps with the Dutch name Westerwoldsche Aa , is a border river between Germany and the Netherlands .

The Westerwoldsche Aa is created near Wessinghuizen (municipality of Stadskanaal ) from the union of the Mussel Aa and the much larger Ruiten Aa, which is therefore to be regarded as its hydrological upper course.

River course

Ruiten Aa near Sellingen

The course of the Ruiten Aa begins today on the eastern outskirts of Ter Apel in the municipality of Vlagtwedde . It flows slightly meandering northwards. The village of Sellingen, also part of Vlagtwedde, lies between it and the Ruiten-Aa-Kanaal, which is parallel to the east . 10 km further north it flows between the core town of Vlagtwedde and Onstwedde to the west . Here the Mussel-Aa-Kanaal crosses it on the Haverlandse Brug. The Mussel Aa flows from the left less than two kilometers further. From this confluence on, the river is called Westerwoldsche Aa .

It now flows in the municipality of Bellingwedde first through Wedde and then east past Blijham . There the Veendiep connects it with the Verenigt Kanaal (BI Tijdenskanaal) which runs 6 km to the east. From its mouth it is navigable and has been severely straightened. The navigable Pekel Aa flows from the southwest at Oudeschans , which emerges from the Pekelerhoofddiep at Oude Pekela and flows past the eastern outskirts of Winschoten . From there on, the Westerwoldsche Aa continues its direction to Bad Nieuweschans . From there to where it flows into the Dollart , it forms the border between Germany and the Netherlands.

Its estuary through the Dollart is called Buiten-Aa (Outer Aa) or Schanskerdiep and flows 2½ km westward along the Dutch bank before turning north towards Groote Gat , which can also be counted as part of the river.

Westerwolder Aa (Groningen)
Ruiten Aa – Westerwoldsche Aa in the province of Groningen
Location dot green.svg = origin of the Ruiten-Aa
Location dot purple.svg= origin and  Location dot blue.svg= mouth of the Mussel-Aa
Location dot teal.svg= mouth of the Pekel-Aa
Location dot cyan.svg= mouth of the Westerwoldsche Aa

Sources of information

  • ANWB / VVV Topographical Map No. 4 (Groningen East) and No. 7 (Drenthe East)


  • General hydrographic lexicon of all streams and rivers in Upper and Lower Germany , 1741, p. 4, digitized

Individual evidence

  1. http://pdokviewer.pdok.nl/ + https://www.umweltkarten-niedersachsen.de/
  2. The waterways in Groningen and Drente