Baadenberger Senke, Stöckheimer See and Große Laache

At its heart is the Stöckheimer See, a large lake that emerged from a quarry east of the Stöckheimer Hof. Gravel extraction has ceased and there is no fishing use; the water is clear and the banks are partly lined with narrow strips of reed and reedmace. On the northern shore, a steep bank about two metres high offers potential nesting sites for the sand martin. South of the farmstead lie further quarry waters of the so-called Baadenberger Senke: the western lake is used for angling and is surrounded by embankments up to 15 metres high with species-rich vegetation, while the eastern lake, with its roughly three-metre steep bank, remains undisturbed. Many marsh frogs were recorded here in 1998. The waters form part of a network of quarry lakes between Cologne-Pesch and Pulheim.

Around the Stöckheimer Hof, with its stables and horse paddocks, the scene is shaped by richly structured field copses, including old oaks up to a metre in trunk diameter and plenty of deadwood. A path south of the farmstead is lined with old sweet chestnuts. The overgrown park to the south-east, with its high proportion of old trees, is especially significant for cavity-nesting birds. At its edge stands a row of giant sequoias designated as a natural monument, whose roots are partly affected by the adjacent gravel extraction.