Its eponymous heath mere makes the second of the three Natura2000 sites in Diersfordter Wald unique in the Lower Rhine lowlands and the Cologne Bight.
The nature reserve thus designated as early as in 1936 has a surface area of 100 hectares and a huge number of near-natural habitats that blend into each other, e.g. an open heath mere, moors and wet heaths, but also dry heaths and neglected sand grassland. It is the only place in Kreis Wesel where you can find Luronium natans.
The woods around the heath mere are mostly near-natural oak-birch-tree woods, with some non-natural spruce woods interspersed. The project is to turn these into oak woods.
From the Kanonenberge car park, a 2 km circular route leads you around the Schwarzes Wasser.
For further information, please consult the Natura2000-Document and the nature reserve Diersfordter Wald description.