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
                                   1.1 (Drainage system) Arctic Ocean Basin
                                   1.2 (Drainage system) Atlantic Ocean Basin
                                   2.1 (Drainage system) Caspian Sea Basin
                                   2.2 (Drainage system) Aral Sea Basin (Asia)
                                   2.3 (Drainage system) Lake Balkhash Basin (Asia)
                                   2.4 (Drainage system) Tarim Basin (Asia)
                                   2.5 (Drainage system) Central Asian Internal Drainage Basin (Asia)
                                   2.6 (Drainage system) Dead Sea Basin (Asia)
                                   3.1 (Drainage system) Lake Chad Basin (Africa)
                                   3.2 (Drainage system) Okavango River Basin (Africa)
                                   4 (Drainage system) Indian Ocean Basin
                                   5 (Drainage system) Lake Eyre Basin (Australia)
                                   6 (Drainage system) Pacific Ocean Basin
                                   7 (Region) Great Basin (North America)
                                   8 (Drainage system) Southern Ocean Basin
                                   9.1 (Lake) Lake Hodgson (Antarctica: Antarctic Peninsula)
                                   9.2 (Lake) Lake Ellsworth (Antarctica)
                                   9.3 (Lake) Lake Whillans (Antarctica)
                                   9.4 (Lake) Lake Vostok (Antarctica)