Watermael-Boitsfort or Watermaal-Bosvoorde, often simply called Boitsfort in French or Bosvoorde in Dutch, is one of the 19 municipalities of the Brussels-Capital Region, Belgium. Located in the south-eastern part of the region, it is bordered by Auderghem, the City of Brussels, Ixelles, and Uccle, as well as the Flemish municipalities of Hoeilaart, Overijse and Sint-Genesius-Rode. In common with all of Brussels' municipalities, it is legally bilingual (French–Dutch).

Auderghem or Oudergem is one of the 19 municipalities of the Brussels-Capital Region, Belgium. Located in the south-eastern part of the region, along the Woluwe valley and at the entrance to the Sonian Forest, it is bordered by Etterbeek, Ixelles, Watermael-Boitsfort, and Woluwe-Saint-Pierre, as well as the Flemish municipalities of Tervuren and Overijse. In common with all of Brussels' municipalities, it is legally bilingual (French–Dutch).