The Emscher River is a river located in the North Rhine-Westphalia region of Germany. It flows for about 80 kilometers, primarily through the industrial area of the Ruhr. Historically, the river was heavily polluted due to industrial waste, but efforts have been made to restore its natural environment. The Emscher is part of the larger Emscher River Basin, which includes several tributaries. The river is significant for local ecosystems and is undergoing a major restoration project aimed at improving water quality and enhancing biodiversity in the area.