The Sonian Forest or Sonian Wood (Dutch: Zoniënwoud, French: Forêt de Soignes) is a 4,421-hectare (10,920-acre) forest that lies at the south-eastern edge of Brussels, Belgium. The forest lies in the Flemish municipalities of Sint-Genesius-Rode, Hoeilaart, Overijse and Tervuren, in Uccle, Watermael-Boitsfort, Auderghem and Woluwe-Saint-Pierre in the Brussels-Capital Region and in the Walloon towns of La Hulpe and Waterloo. Thus it stretches out over the three Belgian Regions. It is maintained by Flanders (56%), the Brussels-Capital Region (38%) and Wallonia (6%). There are some contiguous tracts of privately held forest and the Kapucijnenbos, the "Capuchin Wood", which belongs to the Royal Trust.