O 11 Quarries and Streams
Very difficult full-day tour with 2 steep climbs | special signposts in the Harz National Park, many hikers | some short trail sections, technically medium difficult | long asphalt section along the Oker Reservoir | passes through Altenau town centre | crosses B 4 twice – take care at Marienteich crossing! | heavy vehicles on the quarry access road and around the Oker Reservoir | bus traffic from Luisenbank onward.