The approximately seven-hectare Düne Tannenbusch nature reserve was first designated by the City of Bonn in 1989 by means of a regulatory ordinance and is currently protected by the Kottenforst landscape plan dated February 27, 2013. The area is located in the middle of a residential area in the district of Tannenbusch and represents an important biotope within the settlement context in the north of Bonn.

It is the relict of an inland dune that was formed around 10,000 years ago. Before re-vegetation after the last ice age, masses of sand were piled up in this area to form a dune. The dune consists of pure sand and is therefore very dry and nutrient-poor, so that only vegetation adapted to these extreme conditions has been able to establish itself here. It serves as a habitat for endangered animal and plant species, especially dry and nutrient-poor grassland species and insects.

In addition to the typical plant species, the dune also serves as a habitat for numerous insect species. In order to secure the area as a habitat for animals and plants, the Bonn Biological Station regularly carries out maintenance measures in the nature reserve. The focus of maintenance is on preserving the characteristic mosaic of open sandy areas and sparse vegetation and protecting it from the slow onset of scrub encroachment.