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) American Mediterranean Sea Basin (America)
                                       (Drainage basin) Gulf of Mexico Basin
                                         (Drainage basin) Pearl River Basin (United States: Mississippi, Louisiana)
                                           0.301046N0893134W (Stream) Pearl River (United States: Mississippi, Louisiana)
                                           1t.0.301007N0893605W (Lake) Little Lake (United States: Louisiana: St. Tammany Parish)
                                           1t.1t.301038N0893623W (Stream) West Middle River (United States: Louisiana: St. Tammany Parish)
                                           2t.0.301156N0893523W (Stream) Old Pearl River (United States: Louisiana: St. Tammany Parish)
                                           2t.s1.301305N0893709W (Stream) Middle River (United States: Louisiana: St. Tammany Parish)
                                           2t.s2.301304N0893708W (Stream) East Middle River (United States: Louisiana: St. Tammany Parish)
                                           3d.0.300941N0893854W (Stream) West Pearl River (United States: Louisiana: St. Tammany Parish)
                                           3d.s1.303132N0894822W (Stream) Bradley Slough (United States: Louisiana: St. Tammany Parish)
                                           3d.s2.303505N0895007W (Stream) Bogue Chitto (United States: Louisiana: St. Tammany Parish)