Herzogsberge, Nature reserve in Cremlingen and Sickte, Germany

Herzogsberge is a 266-hectare nature reserve southeast of Braunschweig, protecting the open land of a former military training ground on hilly relief and adjacent oak and beech mixed forests. The open areas are lean lowland hay meadows and purple moor-grass meadows, with small sand grasslands, bare soil patches, and temporary ponds. The Reitlingsgraben and Cremlinger Bach streams cross the reserve, and a salt spring lies in a wet meadow in the north.

The Herzogsberge were long used as a military training ground near Cremlingen before being placed under nature protection on 19 July 2019 under the code NSG BR 150. The new reserve replaced parts of the older landscape protection area "Herzogsberge und angrenzende Landschaftsteile", which in August 2019 was absorbed into the larger "Nieder- und Oberdahlumer Holz, Lagholz, Hötzumer Forst, Obersickter Holz und angrenzende Landschaftsteile". Since late 2017, 127 hectares of the site have belonged to the Nationales Naturerbe, and over 40 hectares of its woods are managed under the NWE-10 programme for natural forest development.

The open areas are mown meadows and Molinia grasslands, grazed at times by sheep to keep them open. In the wet meadow around the salt spring grow plants of saline soil such as common saltmarsh-grass and marsh marigold, with marsh helleborine and broad-leaved helleborine in the fen meadows.

The reserve lies southeast of Braunschweig between Cremlingen and Sickte, with the Reitlingsgraben and Cremlinger Bach running through it. Parts of the open land are grazed by sheep at times, so keep to the paths and keep dogs on a lead. Sturdy footwear helps on the uneven, sometimes wet ground.

The salt spring in the north feeds a wet meadow of tall herbs where common saltmarsh-grass, marsh marigold and devil's-bit grow, with globeflower appearing only here and there. The grassland is grazed by sheep at times to keep it open.