Grez-Doiceau is a municipality of Wallonia located in the Belgian province of Walloon Brabant. On January 1, 2006, Grez-Doiceau had a total population of 12,403. The total area is 55.44 square kilomet

The Dyle is a river in central Belgium, left tributary of the Rupel. It is 86 kilometres long. It flows through the Belgian provinces of Walloon Brabant, Flemish Brabant and Antwerp. Its source is in