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) Arkansas River Basin (North America)
                                             0.334630N0910415W (Stream) Arkansas River (United States: Colorado, Kansas, Oklahoma, Arkansas)
                                             01t.340451N0912635W (Stream) Bayou Meto (United States: Arkansas: Arkansas County)
                                             02t.0.345035N0922646W (Stream) Maumelle River (United States: Arkansas: Pulaski County)
                                             02t.1.345243N0923400W (Lake) Lake Maumelle (United States: Arkansas: Pulaski County)
                                             03t.345801N0923505W (Stream) Fourche LaFave River (United States: Arkansas: Perry County)
                                             04t.351010N0925427W (Stream) Petit Jean River (United States: Arkansas: Yell County)
                                             05.352114N0932346W (Lake) Lake Dardanelle (United States: Arkansas: Johnson County)
                                             06.0.352738N0940145W (Lake) Ozark Lake (United States: Arkansas: Crawford County)
                                             06.1t.352800N0940231W (Stream) Mulberry River (United States: Arkansas: Franklin County)
                                             07.352150N0945432W (Lake) Robert S Kerr Reservoir (United States: Oklahoma: Haskell County)
                                             08t (Drainage basin) Canadian River Basin (United States: Oklahoma, Texas, New Mexico)
                                             09t.0.354732N0951740W (Stream) Neosho River (United States: Oklahoma: Muskogee County)
                                             09t.1t.382309N0960323W (Stream) Cottonwood River (United States: Kansas: Lyon County)
                                             10t.354801N0951828W (Stream) Verdigris River (United States: Oklahoma: Muskogee County)
                                             11t.361014N0961619W (Stream) Cimarron River (United States: Colorado, Kansas, Oklahoma; Arkansas River)
                                             12t.0.363558N0970311W (Stream) Salt Fork Arkansas River (United States: Oklahoma: Kay County)
                                             12t.1t.363723N0971438W (Stream) Chikaskia River (United States: Oklahoma: Kay County)
                                             12t.2t.364940N0981938W (Stream) Medicine Lodge River (United States: Oklahoma: Alfalfa County)
                                             13t.370257N0970002W (Stream) Walnut River (United States: Kansas: Cowley County)
                                             14t.371917N0970959W (Stream) Ninnescah River (United States: Kansas: Sumner County)
                                             15t.381007N0990544W (Stream) Pawnee River (United States: Kansas: Pawnee County)
                                             16t.380233N1020733W (Stream) Two Butte Creek (United States: Colorado: Las Animas County)
                                             17t.380354N1031037W (Stream) Purgatoire River (United States: Colorado: Bent County)
                                             18t.380422N1031935W (Stream) Horse Creek (United States: Colorado: Otero County)