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
                                   "terrestrial and freshwater ecoregions"
                                     (Bioregion) Old World
                                       (Biogeographic realm) Afrotropic
                                         (Ecoregion complex) Arabian Highland Woodlands and Shrublands
                                           (Terrestrial ecoregion) Al Hajar Al Gharbi montane woodlands (Afrotropic)
                                           (Terrestrial ecoregion) Arabian Peninsula coastal fog desert (Afrotropic)
                                           (Terrestrial ecoregion) Southwestern Arabian foothills savanna (Afrotropic)
                                           (Terrestrial ecoregion) Southwestern Arabian montane woodlands (Afrotropic)