The Kellerwald is a low mountain range reaching heights of up to 675 m in the western part of northern Hesse, Germany.Geologically the Kellerwald, made up mainly of palaeozoic rocks, belongs to the Rhenish Slate Mountains.Scenically, however, it is also grouped as a separate entity with the Hessian Basin, because the rivers Eder and Itter form a natural boundary.The conservation efforts have yielded, perhaps most importantly, one of Central Europe's last contiguous broadleaf forests of international grade.Since the 19th century, the northern part of the Kellerwald (since 2004, the Kellerwald-Edersee National Park), as hunting woods for the Princes of Waldeck, has been surrounded by gates.The main tree here is the beech, which is predominant here in acidic-soil (shale, greywacke, quartzite) woodrush-beech forest.In cool and damp stream dales grows the rare, highly poisonous common monkshood.In the Kellerwald, parts of which are also a Special Protection Area (for birds), a number of bird species still or once again breed, among them the black stork, the common raven, six kinds of woodpecker (among them the rare middle spotted woodpecker and the grey-headed woodpecker), the black and the red kite (which here reach their highest population density anywhere in Hesse), the peregrine falcon, the Tengmalm's owl, the honey buzzard, the Eurasian eagle owl and the great grey shrike.