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 system) Atlantic Ocean Basin
                                     (Drainage system) American Mediterranean Sea Basin (America)
                                       (Drainage system) Gulf of Mexico Basin
                                         (Drainage system) Mississippi River Basin (United States, Canada)
                                           (Drainage system) 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 system) 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 system) 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)