The term district, in the context of China, is used to refer to several unrelated political divisions in both ancient and modern China. In the modern context, district, ward, or sub-city (Chinese: 区), formally city-governed district, city-controlled district, or municipal district (Chinese: 市辖区), are subdivisions of a municipality or a prefecture-level city. The rank of a district derives from the rank of its city. Districts of a municipality are prefecture-level; districts of a sub-provincial city are sub-prefecture-level; and districts of a prefecture-level city are county-level.