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
                                     0 (Ocean) Arctic Ocean
                                     01 (Sea) Greenland Sea
                                     02.1 (Sea) Barents Sea (Europe)
                                     02.2 (Drainage basin) White Sea Basin (Russia)
                                     03 (Sea) Kara Sea
                                     04 (Drainage basin) Ob River Basin (Asia)
                                     05 (Drainage basin) Yenisei River Basin (Asia)
                                     06.1 (Sea) Laptev Sea
                                     06.2 (Drainage basin) Lena Basin (Russia)
                                     07.1 (Sea) East Siberian Sea (Russia)
                                     07.2 (Drainage basin) Kolyma River Basin (Asia)
                                     08 (Drainage basin) Chukchi Sea Basin
                                     09 (Drainage basin) Beaufort Sea Basin
                                     10.1 (Drainage basin) 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)