The term 'German Industrial Area' refers to two distinct regions in Germany: the Ruhr and the Saar. The Ruhr is a large urban area located in the state of North Rhine-Westphalia, and is known for its heavy industry and coal mining. The Saar is a smaller region located in the state of Saarland, and is known for its steel production. Both regions have been important to the German economy since the 19th century.