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) Pacific Ocean Basin
                                     (Drainage basin) Columbia River Basin (North America)
                                       (Drainage basin) Snake River Basin (United States)
                                         (Drainage basin) Clearwater River Basin (Idaho)
                                           (Drainage basin) North Fork Clearwater River Basin (Idaho)
                                             (Stream) North Fork Clearwater River (Idaho)