331,575 (31 Dec 2010)
| North Rhine-Westphalia|
1 August 1929
| Witten/Herdecke University|
TSG Sprockhövel, TSG Herdecke
Ruhr, Haus Kemnade, Hardenstein Castle, Henrichshütte, LWL‑Industriemuseum Henrichshütte Hattingen
The Ennepe-Ruhr-Kreis is a district in the center of North Rhine-Westphalia, Germany. It is part of the southern Ruhr urban area and has ca. 324,000 inhabitants (2012). The district's seat (capital city) is Schwelm; the largest of its nine towns is Witten.
The name of the district describes its geographical location – it is located in the valleys of the rivers Ruhr and Ennepe. Geologically it is part of the north-eastern Rhenish Massif, a Mittelgebirge landscape; only small parts of Witten belong to the flat Westphalian Lowland.
The district consists of nine municipalities, all entitled "Stadt" (town or city).
The Ennepe-Ruhr-Kreis is bounded by (from the north and clockwise) the district-free cities of Bochum, Dortmund and Hagen, the districts of Märkischer Kreis (with Schalksmühle and Halver) and Oberbergischer Kreis (with Radevormwald), the city of Wuppertal, the district of Mettmann (with Velbert) and the city of Essen.
The district was created in 1929 by merging the former district of Schwelm with parts of the former districts of Hattingen and Hagen. In 1970 and 1975 it was modified a bit during the reorganization of the districts in North Rhine-Westphalia; most notable was the inclusion of the previously independent city of Witten in 1975.
In the middle of the coat of arms there is the checked red-white bar of the County of Mark, which owned the area in medieval times. The two wavy lines above and below depict the two rivers which gave the district its name, the Ruhr and the Ennepe.