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) Biosphere (Earth) - zone of life "terrestrial and freshwater ecoregions" (Bioregion) New World (Biogeographic realm) Nearctic "terrestrial ecoregions" (Nearctic) (Terrestrial ecoregion) Northern mixed grasslands (Nearctic) "Canada" (Northern mixed grasslands) 1 "Alberta" (Canada; Northern mixed grasslands) 2 "Saskatchewan" (Canada; Northern mixed grasslands) 3 "Manitoba" (Canada; Northern mixed grasslands)