Gladenbach Uplands

The Gladenbach Uplands (), named after their central town of Gladenbach, is a range of hills up to 609 m high in the Rhine Massif in Germany, on the junction of the Rothaar Mountains (north and northwest), Westerwald (southwest), (Eastern) Hintertaunus (in the south) and West Hesse Highlands in the east.
It lies in Central Hesse within the districts of Marburg-Biedenkopf, Lahn-Dill and Gießen within the so-called Lahn-Dill-(Dietzhölze-) loop. Small parts of the Upper Lahn Valley in the northwest belong, together with the town of Bad Laasphe, also to the district of Siegen-Wittgenstein, North Rhine-Westphalia.
The Gladenbach Uplands are geographical unit 320 which is part of the natural region 32, the Westerwald, in the Germany's system of natural regions. The Gladenbach Highlands is largely coextensive with the Lahn-Dill Uplands Nature Park which extends further west, however, but is somewhat less extensive in the southeast and whose boundaries tend to line up with those of the sponsoring municipalities. In addition, not insignificant areas belong to the historical Hessian Hinterland, which is why the two named articles refer to one another, as far as regional associations, culture and history are concerned. Geology and mining will be largely covered in the article on the Lahn-Dill Region
Location and boundaries.
On the rivers Lahn and Dill the following towns - clockwise from the north - border the Gladenbach Uplands:
The northwest transitions to the Rothaar Mountains are comparatively fluid. Here the watershed between the Lahn tributaries of the Banfe and Perf define the boundary.
Rivers and streams.
The natural regions mentioned above are generally divided between the catchment areas of the der Lahn and Dill tributaries and the landscapes separated by these rivers.
The most important watercourses, in addition to the boundary rivers of the Lahn, Dill and Dietzhölze – are the Aar, the Salzböde, the Perf and Allna. 
The following rivers and streams are sorted in clockwise order i.e. down the Lahn and up the Dill, beginning with the upper reaches of the Lahn in the north and cover a catchment area of over 20 km²:
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The outer boundary of the Gladenbach Uplands is formed by the Lahn and Dill accompanied in the north (upper reaches of the Lahn) by the B 62, in the east by the B 3 Marburg-Gießen (mostly autobahn-like, clearly external in the Marburg area), in the east, south of the B 49 Gießen-Wetzlar (mostly autobahn-like) and in the southwest (lower reaches of the Dill) by the A 45. The Bundesstraße 253 Dillenburg-Biedenkopf (see above) roughly closes the remaining gap.
Waterbodies.
The most important reservoir in the Gladenbach Uplands is the Aartalsee (57 ha, 270 m above NN) in the Niederweidbach Basin, followed by the Perf Reservoir (18 ha, 301 m) in the Breidenbach Bottom (Breidenbach Bottom).
Hills.
The hills of the Gladenbach Uplands, arranged by ridge or natural region, include the following: 