The Langenberg lies on the border of the Hochsauerland and Waldeck-Frankenberg districts, where the Hochsauerland region transitions into the Upland, between Olsberg-Bruchhausen in the north-northwest, Willingen in the northeast and Niedersfeld in the southwest. The Langenberg summit is about 10 m southwest of the Hessian-Westphalian state border. The Langenberg’s neighbouring peaks include the Hoppernkopf to the north, the Mittelsberg to the east, the Hegekopf to the east-southeast, the Hopperkopf to the southeast, the Clemensberg to the south-southwest and Auf dem Sternrodt to the west. The Burbecke stream emerges west of the Langenberg and the Raken on its northern flank, both within the catchment area of the Gierskoppbach. The Langenberg is passed to the east in a south-north direction by the upper reaches of the Hoppecke, into which a small brook runs that comes out of a valley - Der Keller - on the southeast side of the mountain. South of the Langenberg are the crosstracks known as the Oberer Burbecker Platz and Unterer Burbecker Platz. A section of the long-distance footpath known as the Rothaarsteig runs by the summit to the west in a north-south direction, passing a historic boundary stone. There few trees on the Langenberg's rounded summit itself and it widens out into a mountain heathland to the east; the rest of the mountain is, however, thickly forested.
Height
About 15 m south-southeast of the Langenberg summit, shown on the German Topographical Map as being, and about 20 m southwest of the aforementioned state border, there is a triangulation station of the German Primary Triangulation Network at a height of . At the summit is a stone with a metal plate inscribed as follows: Langenberg 843 m über N.N. − höchster Berg in N R W. Erroneously, the Kahler Asten near Winterberg is often cited as the highest mountain in the region. This is only , but is much better known than the Langenberg due to its weather station and because its mountaintop restaurant in the Astenturm and its 862 m high observation tower are popular local destinations. The highest accessible point in the Rothaar Mountains is the observation platform of the Hochheideturm near Willingen with a height of 875.5 m.
