Bochum shares border with Dortmund
Geography
Geographical position
The city lies on the low rolling hills of Bochum land ridge (Bochumer Landrücken), part of the Ruhrhöhen (highest elevations) between the Ruhr and Emscher rivers at the border of the southern and northern Ruhr coal region. The highest point of the city is at Kemnader Straße (Kemnader Street) in Stiepel at 196 metres (643 ft) above sea level; the lowest point is 43 metres (141 ft) at the Blumenkamp in Hordel.
The terrain of Bochum is characterised by rolling hills that rarely have more than three per cent graduation. Steeper graduation can be found at the Harpener Hellweg near the Berghofer Holz nature reserve (3.4%), at Westenfelder Straße in the borough of Wattenscheid (3.47%), or at Kemnader Straße, which begins at the banks of the Ruhr in Stiepel (71 m, 233 ft), and rises to its highest point in the centre of Stiepel (196 m, 643 ft, a 5.1% increase).
The city extends north to south 13.0 km (8.1 mi) and 17.1 km (10.6 mi) east to west. The perimeter of the city limits is 67.2 km (41.8 mi).
It is surrounded by the cities of (in clockwise direction) Herne, Castrop-Rauxel, Dortmund, Witten, Hattingen, Essen and Gelsenkirchen.
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