Gaim, Nature reserve in Hanover and Sehnde, Germany

Gaim is a nature reserve spanning about 91 hectares across Hanover and Sehnde. The woodland is dominated by oak and hornbeam trees with a rich layer of herbaceous plants and wildflowers beneath them.

Because the Gaim lies in a periodically waterlogged depression, it could not be used as farmland and was never cleared. The woodland therefore survived as part of a formerly extensive forest on Hanover's southeastern edge. In 1994 it became a nature reserve, and in January 2019 it was merged into the larger Bockmerholz, Gaim protected area.

The forest lies in a periodically wet depression that could not be ploughed, so it was never cleared and kept its oak-hornbeam woodland. Since 1994 it has been a nature reserve, and in January 2019 it was merged into the larger Bockmerholz, Gaim reserve. Visitors walking the paths see a rich spring flora of early bloomers beneath the trees.

The A7 motorway runs through the Gaim, and the Hannover-Wülferode service area was built inside the woodland; the Mittellandkanal cuts the reserve in the northeast. Forest tracks and a few narrow paths lead through the trees, and about a quarter of the area is left unmanaged as natural forest.

Approximately one quarter of the woodland is left completely unmanaged to serve as a research area for understanding how forests develop without human influence. These uncontrolled sections reveal natural forest processes that remain hidden elsewhere.