| Native Name: | Weser-Aller-Flachland |
| Subdivision Type: | State |
| Subdivision Name: | Lower Saxony, Germany |
| Subdivision Type1: | Primary natural region |
| Subdivision Name1: | North German Plain |
| Subdivision Type2: | Secondary natural region |
| Subdivision Name2: | Central North German Plain |
| Subdivision Type3: | Tertiary natural region |
| Subdivision Name3: | North German Geest |
| Coordinates: | 52.3908°N 10.1208°W |
The Weser-Aller Plains and Geest[1] (German: Weser-Aller-Flachland) is a natural regional unit of the North German Plain in Germany. It extends over most of the southern catchment of the Aller including the lower reaches of the Oker and Leine and is bounded in the west by the Middle Weser.
It is also bounded, from a natural region perspective, by the Stade Geest, the Luneburg Heath, the Wendland and the Altmark in the north; in the east by the Central German Black Earth Region (Mitteldeutsches Schwarzerdegebiet), in the south by the Northern Harz Foreland and Lower Saxon Börde and, in the west, by the Dümmer-Geest Lowland and Ems-Hunte Geest.[2] [3] In the BfN numbering scheme it is number D31.
In the system of natural regions of Germany the Weser-Aller Plains are a tertiary level major region and major unit group (Number 62, two-digit) within the North German Plain (primary level major region). They are split as into the following major units (fourth level regions, three-digits) :[4] [5]