or "zone" (264 barangays), but they are fully functioning barangays and are not just mere administrative categories. Sitios and puroks Many barangays are divided into sitios and puroks. Sitios are usually hamlets within rural barangays where human settlement is polycentric, i.e., multiple communities spread across a wide area, separated by farmland, mountains, or water. Puroks are often neighborhoods or zones in densely populated areas of barangays of more urban character. Purok and sitio boundaries are rarely defined precisely and may use natural landmarks such as roads, rivers or other natural features to unofficially delineate divisions. A single sitio or purok, or groups of these, form the basis of creating a new barangay. Sitios and puroks are not local government units and therefore do not officially have an organized government subordinate to the barangay. However, there are sometimes unofficial arrangements that result in direct representation of purok or sitio interests in the barangay government. For example, a barangay council member may be officially designated as a purok leader, while sitio leaders may be appointed and drawn from the hamlet's residents. Judicial regions The Philippines is divided into thirteen judicial regions, to organize the judiciary. The judicial regions still reflect the original regional configuration introduced by President Ferdinand Marcos during his rule, except for the transfer of Aurora to the third judicial region from the fourth. These judicial regions are used for the appointment of judges of the different Regional Trial Courts. Legislative districts To elect legislators at national, regional, and local levels, the Philippines is divided into legislative districts. National The electoral constituencies for the election of territory-based members of the House of Representatives of the Philippines are more precisely representative or congressional districts. Each province is guaranteed at least one seat, and more populous provinces are also provided more. Many cities that have a population of at least 250,000 inhabitants are also granted one or more seats. If a province or a city is composed of only one legislative district, it said to be the lone district (e.g., the "Lone District of Guimaras"). Multiple districts within more populous cities and provinces are given numerical designations (e.g., the "2nd District of Cagayan"). Regional The electoral constituencies for the election of members of the Bangsamoro Parliament will be called parliamentary districts, the Bangsamoro Transition Authority will decide the parliamentary districts for the first parliamentary elections, with the succeeding elections' districts being decided