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) "surface" (Earth)
                                   (Oceanic basin) "Arctic Basin" (Arctic Ocean)
                                     1.870000N0800000E (Undersea basin) Eurasia Basin (Arctic Ocean)
                                     2.880000N1400000E (Undersea ridge) Lomonosov Ridge (Arctic Ocean)
                                     3.800000N1700000W (Undersea basin) Amerasia Basin (Arctic Ocean)