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 Lake Pontchartrain Basin (United States: Louisiana) 0.301102N0900731W (Lake) Lake Pontchartrain (United States: Louisiana: St. Tammany Parish) 1t (Drainage basin) Lake Maurepas Basin (United States: Louisiana, Mississippi) 2t (Drainage basin) Tangipahoa River Basin (United States: Louisiana, Mississippi) 3t (Drainage basin) Tchefuncte River Basin (United States: Louisiana)