Mülheim, officially Mülheim an der Ruhr (German pronunciation: [ˈmyːlhaɪm ʔan deːɐ̯ ˈʁuːɐ̯]) and also described as "City on the River", is a city in North Rhine-Westphalia in Germany. It is located in the Ruhr Area between Duisburg, Essen, Oberhausen and Ratingen. It is home to many companies, especially in the food industry, such as the Aldi Süd Company, the Harke Group and the Tengelmann Group.