Arrondissements of Belgium

Arrondissements of Belgium are subdivisions below the provinces of Belgium. There are administrative, judicial and electoral arrondissements. These may or may not relate to identical geographical areas.
Belgium, a federalized state, geographically consists of three regions, of which only the Flemish Region and the Walloon Region are subdivided into five provinces each; the Brussels-Capital Region is neither a province nor is it part of one.
Administrative.
The 43 administrative arrondissements are an administrative level between the municipalities and the provinces. Brussels-Capital forms a single arrondissement for all 19 municipalities in the region by that name.
Judicial.
Belgium has 12 judicial arrondissements:
Until March 31, 2014 Belgium had 27 judicial arrondissements. These are now sections of today's 12 judicial arrondissements. In addition, the arrondissement Brussels was divided into the sections Brussels and Halle-Vilvoorde.
Electoral.
Until the end of 1999 the electoral districts for the election of the parliaments were "electoral arrondissements"; since the start of 2000 these are the ten "provinces". The arrondissement of Brussels-Capital (geographically coinciding with the Brussels-Capital Region) is not part of any province and consequently forms its own electoral district.
As the only part of Belgium, the Walloon Parliament still uses electoral arrondissements. Each electoral arrondissement consists of at least one (administrative) arrondissement. There were previously 13 such electoral districts, but they have since been reduced to 11. Each of these electoral districts take their names from the arrondissements they consist of, usually decreasing in order of population.