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) Arctic Ocean Basin
                                     (Drainage basin) White Sea Basin (Russia)
                                       1 (Sea) White Sea (Russia)
                                       2.1 (Bay) Onega Bay (Russia)
                                       2.2.1 (Stream) Kem River (Russia: Kareliya)
                                       2.2.2 (Lake) Lower Kuyto (Russia: Kareliya)
                                       2.2.3 (Lake) Middle Kuyto (Russia: Kareliya)
                                       2.2.4 (Lake) Upper Kuyto (Russia: Kareliya)
                                       2.3.1 (Stream) Onega River (Russia: Arkhangel'skaya Oblast')
                                       2.3.2 (Lake) Lake Lacha (Russia: Arkhangel'skaya Oblast')