Hydrographic Sectors — Meeting 2012 — CD Carthage

The hydrographic division is the set of four hierarchical partitions of the French territory carried out according to descending hydrographic areas: — hydrographic region (1st order), — hydrographic sector (2nd order), — hydrographic subsector (3 rd order), hydrographic area (4th order). A hydrographic region is divided into a maximum of 10 sectors, and one sector is divided into a maximum of 10 subsectors.水文分区（hydrographic division）指依据水文区域降序划分规则，针对法国领土构建的四级层级分区集合，具体包含以下四个层级： — 一级水文大区（hydrographic region，第一阶） — 二级水文分区（hydrographic sector，第二阶） — 三级水文亚分区（hydrographic subsector，第三阶） — 四级水文单元（hydrographic area，第四阶） 单个一级水文大区最多可划分为10个二级水文分区，单个二级水文分区最多可划分为10个三级水文亚分区。