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 system) Pacific Ocean Basin
                                     (Drainage system) Columbia River Basin (North America)
                                       (Drainage system) Snake River Basin (United States)
                                         (Drainage system) Clearwater River Basin (Idaho)
                                           (Drainage system) Middle Fork Clearwater River Basin (Idaho)
                                             (Drainage system) Lochsa River Basin (Idaho)
                                               (Stream) Eagle Mountain Creek (Idaho)