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) Hydrosphere (Earth) - layer of water
                                   (Drainage basin) Atlantic Ocean Basin
                                     (Drainage basin) Amazon River Basin (South America)
                                       1.001000S0490000W (Stream) Amazon (Peru, Colombia, Brazil)
                                       2 (Drainage basin) Xingu River Basin (South America)
                                       3 (Drainage basin) Tapajós Basin (Brazil)
                                       4 (Drainage basin) Madeira River Basin (South America)
                                       5 (Drainage basin) Rio Negro Basin (Colombia, Venezuela, Brazil)
                                       6 (Drainage basin) Purus River Basin (South America)
                                       7 (Drainage basin) Japurá River Basin (South America)
                                       8 (Drainage basin) Marañón River Basin (South America)
                                       9 (Drainage basin) Ucayali River Basin (South America)