Provinces of Belgium
During the second half of the 20th century, Belgium transitioned from a unitary state to a federal state with three Communities and three Regions. As part of the state reforms, the (bilingual) province of Brabant was split in 1995 three ways: into two (unilingual) provinces (Flemish Brabant and Walloon Brabant) and into the (bilingual) Brussels-Capital Region. (The Brussels-Capital Region does not belong to any province, is not a province, and does not contain any provinces.) The two new Brabant provinces became part of the Flemish Region and the Walloon Region respectively. The remaining eight provinces became part of these regions as well, so the Flemish Region and the Walloon Region each contain five provinces.
Municipalities of Belgium
Article 4 of the constitution states that each municipality must belong to only one of the four official language areas that were established in 1962–63. In the three officially unilingual language areas, a couple of dozen municipalities in the vicinity of another language area must provide limited facilities for speakers of that other language. As only a law carried by special majorities can change the language status of any municipality, these arrangements have prevented some small municipalities with facilities to be merged in the 1970s, and thus the most minute Belgian municipalities are still found in this group, notably Herstappe with only 84 inhabitants (in 2006).