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) Palearctic
                                         (Ecoregion complex) Altai-Sayan Montane Forests (Palearctic)
                                           1.1 (Terrestrial ecoregion) Sayan montane conifer forests (Palearctic)
                                           1.2 (Terrestrial ecoregion) Sayan Alpine meadows and tundra (Palearctic)
                                           1.3 (Terrestrial ecoregion) Sayan Intermontane steppe (Palearctic)
                                           2.1 (Terrestrial ecoregion) Altai montane forest and forest steppe (Palearctic)
                                           2.2 (Terrestrial ecoregion) Altai alpine meadow and tundra (Palearctic)
                                           3 (Terrestrial ecoregion) Great Lakes Basin desert steppe (Palearctic)