Flemish Diamond

The Flemish Diamond (Dutch: Vlaamse Ruit) is the Flemish reference to a network of four metropolitan areas in Belgium, three of which are in the central provinces of Flanders, together with the Brussels-Capital Region. It consists of four agglomerations which form the four corners of an abstract diamond shape: Brussels, Ghent, Antwerp and Leuven.

In 2007, approximately 5 million people lived in this area, with a population density of about 820 per square kilometer which accounted for roughly 47% of the total population of the country (c. 10.5 million).