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) Atlantic Ocean Basin
                                     (Drainage basin) Eurafrican Mediterranean Sea Basin
                                       0 (Sea) Mediterranean Sea
                                       1 (Sea) Alboran Sea (Spain, Morocco, Algeria)
                                       2 (Sea) Balearic Sea (Spain)
                                       3 (Sea) Ligurian Sea (Italy)
                                       4 (Sea) Tyrrhenian Sea (Italy)
                                       5.1 (Sea) Ionian Sea (Italy, Greece)
                                       5.2 (Drainage basin) Adriatic Sea Basin (southeastern Europe)
                                       6.1 (Sea) Sea of Crete (Greece)
                                       6.2 (Drainage basin) Aegean Sea Basin (Greece, Turkey)
                                       6.3.401251N0262730E (Strait) Dardanelles (Turkey)
                                       6.4 (Drainage basin) Sea of Marmara Basin (Turkey)
                                       6.5.410326N0290236E (Strait) Bosporus (Turkey)
                                       6.6 (Drainage basin) Black Sea Basin
                                       6.7 (Drainage basin) Sea of Azov Basin (Europe)
                                       7 (Drainage basin) Nile River Basin (Africa)