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) Arctic Ocean Basin
                                     0 (Ocean) Arctic Ocean
                                     01 (Sea) Greenland Sea
                                     02.1 (Sea) Barents Sea (Europe)
                                     02.2 (Drainage system) White Sea Basin (Russia)
                                     03 (Sea) Kara Sea
                                     04 (Drainage system) Ob River Basin (Asia)
                                     05 (Drainage system) Yenisei River Basin (Asia)
                                     06.1 (Sea) Laptev Sea
                                     06.2 (Drainage system) Lena Basin (Russia)
                                     07.1 (Sea) East Siberian Sea (Russia)
                                     07.2 (Drainage system) Kolyma River Basin (Asia)
                                     08 (Drainage system) Chukchi Sea Basin
                                     09 (Drainage system) Beaufort Sea Basin
                                     10.1 (Drainage system) Hudson Bay Basin (North America)
                                     10.2 (Strait) Hudson Strait
                                     11.0 (Sea) Baffin Bay (Canada, Greenland)
                                     11.1.754900N0831500W (Bay) Brae Bay (Canada: Nunavut)