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) Mississippi River Basin (United States, Canada)
                                           (Drainage basin) Red River Basin (North America)
                                             0.310110N0914452W (Stream) Red River (United States: Texas, Oklahoma, Arkansas, Louisiana)
                                             1t.310037N0913851W (Stream) Upper Old River (United States: Louisiana: Concordia Parish)
                                             2t.0.320403N0911336W (Stream) Black River (United States: Louisiana: Tensas Parish)
                                             2t.1t.313742N0914836W (Stream) Little River (United States: Louisiana: Catahoula Parish)
                                             2t.s1 (Drainage basin) Ouachita River Basin (United States: Arkansas, Louisiana)
                                             2t.s2.313754N0914820W (Stream) Tensas River (United States: Louisiana: Concordia Parish)
                                             3t.324132N0940218W (Stream) Big Cypress Bayou (United States: Texas: Marion County)
                                             4t.330536N0935142W (Stream) Sulphur River (United States: Texas, Arkansas)
                                             5t (Drainage basin) Little River Basin (United States: Oklahoma, Arkansas)
                                             6t.335442N0963441W (Stream) Washita River (United States: Texas, Oklahoma)
                                             7t.340651N0981007W (Stream) Wichita River (United States: Texas: Clay County)
                                             s1.342017N0991238W (Stream) North Fork Red River (United States: Texas, Oklahoma)
                                             s2.0.343435N0995754W (Stream) Prairie Dog Town Fork Red River (United States: Texas, Oklahoma)
                                             s2.s1.350009N1015409W (Stream) Palo Duro Creek (United States: Texas: Randall County)
                                             s2.s2.350010N1015409W (Stream) Tierra Blanca Creek (United States: New Mexico, Texas)