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) Atlantic Ocean Basin
                                     (Drainage system) North Sea Basin (Europe)
                                       0.552000N0030000E (Sea) North Sea (Europe)
                                       1.531500N0051500E (Bay) Waddenzee (Netherlands)
                                       2t (Drainage system) Rhine Basin (Europe)
                                       3.514124N0040418E (Lake) Grevelingen (Netherlands)
                                       4.513557N0035356E (Estuary) Oosterschelde (Netherlands: Zeeland)
                                       5.512228N00.5010E (Estuary) Westerschelde (Netherlands: Zeeland)
                                       6.1 (Estuary) Thames Estuary (Great Britain)
                                       6.2t (Drainage system) River Thames Basin (Great Britain)
                                       6.3t (Drainage system) River Medway Basin (Great Britain)
                                       7t (Drainage system) River Crouch Basin (Great Britain)