Natura - nature
   actualia - actual entities
     Mundus Plinius - physical world
       Astra Plinius - celestial bodies
         Universe
           (Supercluster) Virgo-Hydra-Centaurus Supercluster
             (Supercluster) Virgo Supercluster
               (Cluster) Local Group
                 (Galaxy) Milky Way Galaxy veter.
                   (Spiral arm) Orion Arm
                     (Region) Local Bubble
                       Local Interstellar Cloud
                         (Planetary system) Solar System
                           (Planet-satellite system) Earth System
                             (Planet) Earth veter.
                               "spheres" (Earth)
                                 (Sphere) Biosphere (Earth) - zone of life
                                   "geopolitical regions"
                                     (Region) World
                                       (Region) Old World
                                         (Region) Africa
                                           (Region) Central Africa
                                             1 (Country) Chad (1960-present)
                                             2 (Country) Central African Republic (1960-present)
                                             3 (Country) Cameroon (1960-present)
                                             4 (Country) Equatorial Guinea (1968-present)
                                             5 (Country) São Tomé and Principe (1975-present)
                                             6 (Country) Gabon (1960-present)
                                             7 (Region) Congo
                                             8 (Country) Rwanda (1962-present)
                                             9 (Country) Burundi (1962-present)