Baadenberger Senke, Stöckheimer See und Große Laache, Protected area in northern Cologne, Germany

The Baadenberger Senke, Stöckheimer See und Große Laache nature reserve covers 73.5693 hectares east of Pulheim, between the Cologne districts of Auweiler and Mengenich, bounded by the A 1 motorway to the east and the B 59 road to the south. It is registered as protected area K-022 and combines the Baadenberger Senke hollow, the Stöckheimer See lake and the Große Laache wetland.

The area developed from three former gravel extraction sites that operated from the 1960s through the late 1990s. Once quarrying ended, the land was gradually transformed into a protected nature reserve.

The reserve lies between the Cologne districts of Auweiler and Mengenich, east of Pulheim, bounded by the A1 motorway to the east and the B59 road to the south. It is registered as nature reserve K-022, and the surrounding roads make the edge of the area easy to locate for orientation.

Access is provided through marked walking paths that traverse the area and allow visitors of varying abilities to explore the landscape. Swimming, fishing, camping, and barbecuing are not permitted around the water bodies.

The reserve covers 73.5693 hectares and is registered under the protected-area code K-022. It lies east of Pulheim, between the Cologne districts of Auweiler and Mengenich, bounded by the A 1 motorway to the east and the B 59 road to the south.