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)
                                             (Drainage basin) Ouachita River Basin (United States: Arkansas, Louisiana)
                                               0.313753N0914825W (Stream) Ouachita River (United States: Arkansas, Louisiana)
                                               1t.315125N0914709W (Stream) Boeuf River (United States: Louisiana: Catahoula Parish)
                                               2t.323406N0920840W (Stream) Bayou D'Arbonne (United States: Louisiana: Ouachita Parish)
                                               3t.324322N0920350W (Stream) Bayou Bartholomew (United States: Louisiana: Morehouse Parish)
                                               4t.0.330946N0920813W (Stream) Saline River (United States: Arkansas; Ouachita River)
                                               4t.1t.340616N0922339W (Stream) Hurricane Creek (United States: Arkansas: Grant County)
                                               5t.331757N0922104W (Stream) Moro Creek (United States: Arkansas: Bradley County)
                                               6t.334830N0925401W (Stream) Little Missouri River (United States: Arkansas: Clark County)
                                               7t.0.341048N0930236W (Stream) Caddo River (United States: Arkansas: Clark County)
                                               7t.1.341507N0931157W (Lake) De Gray Lake (United States: Arkansas: Hot Spring County)
                                               8.342554N0930732W (Lake) Lake Hamilton (United States: Arkansas: Garland County)
                                               9.343623N0932052W (Lake) Lake Ouachita (United States: Arkansas: Garland County)