Siegen-Wittgenstein in the context of Marburg-Biedenkopf

Altenkirchen (German pronunciation: [ˌaltn̩ˈkɪʁçn̩] ) is a district in Rhineland-Palatinate, Germany. It is bounded by (from the north and clockwise) the North Rhine-Westphalian districts Rhein-Sieg, Oberbergischer Kreis, Olpe and Siegen-Wittgenstein, and the districts of Westerwaldkreis and Neuwied.

The Siegerland (German pronunciation: [ˈziːɡɐˌlant] ) is a region of Germany covering the old district of Siegen (now part of the district of Siegen-Wittgenstein in North Rhine-Westphalia) and the upper part of the district of Altenkirchen, belonging to the Rhineland-Palatinate adjoining it to the west.

Geologically, the Siegerland belongs to the Rhenish Massif (Rheinisches Schiefergebirge, Rhenish Slate Mountains). The point of highest elevation is the Riemen, at 678 metres above sea level. The river Sieg, a right tributary of the river Rhine, has its source in the town of Netphen in the Rothaar Mountains.

Hochsauerlandkreis (German pronunciation: [ˈhoːxzaʊɐlantˌkʁaɪs], lit. 'High Sauerland District') is a Kreis (district) in the east of North Rhine-Westphalia, Germany. Neighboring districts are Soest, Paderborn, Höxter, Waldeck-Frankenberg, Siegen-Wittgenstein, Olpe, Märkischer Kreis.

The district is named “High Sauerland” because two of the highest mountains of the Sauerland mountainous landscape, Langenberg and Kahler Asten are in its territory. With 2,766 ft / 843 m (Langenberg) and 2,762 ft / 842 m (Kahler Asten) these are also the highest mountains of North Rhine-Westphalia.

Olpe (German pronunciation: [ˈɔlpə]) is a Kreis (district) in the south-east of North Rhine-Westphalia, Germany. Neighboring districts are Märkischer Kreis, Hochsauerland, Siegen-Wittgenstein, Altenkirchen, Oberbergischer Kreis.

Lahn-Dill is a Kreis (district) in the west of Hesse, Germany. Neighboring districts are Siegen-Wittgenstein, Marburg-Biedenkopf, Gießen, Wetteraukreis, Hochtaunuskreis, Limburg-Weilburg, Westerwaldkreis.