Unlike most of the municipalities in Belgium, the ones located in the Brussels-Capital Region were not merged with others during mergers occurring in 1964, 1970, and 1975. However, a few neighbouring municipalities have been merged into the City of Brussels, including Haren, Laeken and Neder-Over-Heembeek in 1921. These comprise the northern bulge in the municipality. To the south-east is also a strip of land along the Avenue Louise that was annexed from Ixelles.