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Under construction
Drainage basin: Black Sea Basin (geographical region)
Classification by:

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
                                       (Drainage basin) Black Sea Basin
                                         0 (Sea) Black Sea
                                         1 (Drainage basin) Danube River Basin (Europe)
                                         2 (Drainage basin) Dnieper River Basin (Europe)

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Last updated: 1 Feb 2024