The Dümmer Geest Lowland (German: Dümmer-Geestniederung) is a natural region unit of the 3rd level in northwest Germany that mainly extends over southwestern Lower Saxony with a small area over the border in North Rhine-Westphalia.
It was classified as a "natural region unit of the third-order" or even as a "major unit group", called the Dümmer Geest Lowland and given the number 58 within the classification schema that covered the whole of Germany.
The area of the Dümmer Geest Lowland is roughly bounded by the following line: Dutch border near Meppen – Vechta – Sulingen – Hoya – Nienburg/Weser – Minden – Mittelland Canal to Rheine – Dutch border near Nordhorn.
It thus covers all or part of the following counties: Grafschaft Bentheim, Emsland, Osnabrück, Vechta, Diepholz and Nienburg in Lower Saxony and Minden-Lübbecke and Steinfurt in North Rhine-Westphalia.
Adjacent natural regions of the third level are the Westphalian Basin to the southwest, the Ems-Hunte Geest to the north, the Weser-Aller Plain to the east and the Lower Weser Uplands to the south.