The Bourtanger Moor was a bog in eastern parts in the Dutch provinces of Drenthe and Groningen and the bordering German districts of Bentheim and Emsland. A remaining stretch on the border between Drenthe and the districts Emsland and Betheim is now a nature reserve, the Internationaler Naturpark Bourtanger Moor-Bargerveen.
The Bourtange Swamp had the shape of a V. The western leg covered the valley of the Hunze and ranged towards the city of Groningen. The western part was bordered by the Hondsrug. The eastern leg was located in the valley of the Ems. Between these two legs lays Westerwolde. At its greatest extent the swamp was about 3000 km².
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