Administrative divisions of Iran
To better understand such subdivisions, the following table may be helpful. Assume that province P is divided into two counties: A and B. County A has 3 districts: Central, X, and Y. The Central district is the district that contains City M, the capital of the county. Each district might contain one or more cities or one or more RDs (rural districts). In our example, the Central district contains City M, City N, and RD T composed of the villages V1, V2, V3, and V4, in turn; district X contains City O and RD U; and district Y has no cities and one RD V. The minimal county consists of only one city as the only district, named Central, which is most common. The county B in the following table is of such type, containing only one city Q.