Hoher Lehnberg, Mountain summit in Kreis Olpe, Germany

Hoher Lehnberg is the 668.8 m high western-southwestern shoulder of the Himberg in the Saalhauser Berge, in the Saalhausen district of Lennestadt, Kreis Olpe. Its summit area holds a trigonometric point at 666.8 m and the earthworks of the Wallburg Hoher Lehnberg, a semicircular rampart about 90 by 50 metres enclosing a former small castle.

The summit holds the remains of a hillfort: a semicircular rampart with its open south side facing the steep drop, plus a gate defence, enclosing an area of about 90 by 50 metres where a small castle once stood. It guarded and watched the Kriegerweg, an old north-south road through the Gleierbach valley from Siegen to Paderborn.

The area around the summit is shaped by hiking trails that have been part of local tradition for generations. Visitors today follow the same routes that connect the mountain to nearby communities and regional walking culture.

The terrain is best accessed during dry conditions, as paths can become slippery in wet weather. Sturdy footwear and plenty of water are essential, particularly if walking from the parking areas in Saalhausen or Bracht to the summit.

About 330 metres northeast of the summit lies the Lehnborn spring, a protected natural monument that feeds the Lehnbergsiepen. Its water loops around the mountain in a left-hand arc before draining through the Gleierbach southwards into the Lenne.