Overview
The Ruhr, also referred to as Ruhr area, Ruhr district, Ruhr region, or Ruhr valley, is a polycentric urban area in North Rhine-Westphalia, Germany. With population density of 2,800/km² and a population of over 5 million, it's the largest urban area
Description
Once known for its belching steelworks and filthy coal mines, the Ruhrgebiet – a sprawling post-industrial region of 53 cities and 5.1 million people – has worked hard in recent decades to reboot for a high-tech future.