Sludge is an ecological disaster. In distant times it was said to be a shallow lake fed by many streams and the rains that spilled down the Iragandul hills. The heavy mining, industry, and carelessness of Hjalmarbrodd produces a constant run-off of pollutants that ends up in the waterways and ultimately settles in this former lake. Unlike most areas of the Clans, this place was named by a travelling Tragaran who wryly commented that the lake is more sludge than water. The dwarves changed the name to Sludge in jest and it stuck.