The Arrondissement of Brussels-Capital is the only administrative arrondissement

Arrondissements of Belgium

The federalized country Belgium geographically consists of 3 regions, of which only Flemish Region and Walloon Region are subdivided into 5 provinces each; the Brussels-Capital Region is neither a province nor is it part of one....

 in the Brussels-Capital Region in Belgium

Belgium

Belgium , officially the Kingdom of Belgium, is a federal state in Western Europe. It is a founding member of the European Union and hosts the EU's headquarters, and those of several other major international organisations such as NATO.Belgium is also a member of, or affiliated to, many...

. Because it is the only administrative arrondissement in the Brussels Region, its territory coincides with that of the latter.

The arrondissement is not a part of any province

Provinces of Belgium

Belgium is divided into three regions, two of them are subdivided into five provinces each.The division into provinces is fixed by Article 5 of the Belgian Constitution...

 because the Brussels-Capital Region is extraprovincial, meaning it is not a province, neither does it belong to one, nor does it contain any. However, it is the only Belgian arrondissement that is headed by a Governor

Governor

A governor is a governing official, usually the executive of a non-sovereign level of government, ranking under the head of state...

 and a Vice-Governor.

The Brussels-Capital Region is divided into 19 municipalities, of which the City of Brussels

City of Brussels

The City of Brussels is the largest municipality of the Brussels-Capital Region, and the official capital of Belgium by law....

 is the largest and most populous. See the list of municipalities of the Brussels-Capital Region.

Governor and Vice-Governor

The Governor exercises most of the few remaining powers elsewhere exercised by a provincial governor, particularly in the field of public order, as far as no (federal) law, (regional) decree, ordonnance or decision states otherwise. The Governor is appointed by the Government of the Brussels-Capital Region on the unanimous advice of the Federal Council of Ministers. The regional government also appoints the Vice-Governor, who must have a considerable knowledge of both the French

French language

French is a Romance language spoken as a first language in France, the Romandy region in Switzerland, Wallonia and Brussels in Belgium, Monaco, the regions of Quebec and Acadia in Canada, and by various communities elsewhere. Second-language speakers of French are distributed throughout many parts...

 and the Dutch language

Dutch language

Dutch is a West Germanic language and the native language of the majority of the population of the Netherlands, Belgium, and Suriname, the three member states of the Dutch Language Union. Most speakers live in the European Union, where it is a first language for about 23 million and a second...

and who must ensure that the legislation regarding the use of languages is observed in Brussels.