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) Indian Ocean Basin 0 (Ocean) Indian Ocean 01 (Drainage system) Limpopo River Basin (Africa) 02 (Drainage system) Zambezi River Basin (Africa) 03 (Sea) Mozambique Channel 04 (Drainage system) Galana River Basin 05 (Drainage system) Jubba River Basin (Africa) 06.1 (Sea) Gulf of Aden 06.2 (Drainage system) Red Sea Basin 07.1 (Sea) Gulf of Oman 07.2.263400N0561500E (Strait) Strait of Hormuz (Oman: Musandam) 07.3 (Drainage system) Persian Gulf Basin (Asia) 08.1 (Drainage system) Indus River Basin (Asia) 08.2 (Sea) Arabian Sea 09.0 (Bay) Bay of Bengal 09.1.0.225202N0904546E (Drainage system) Meghna River Basin (Bangladesh) 09.1.1t.232200N0903200E (Drainage system) Ganges River Basin (Asia) 09.1.2t.240200N0905900E (Drainage system) Brahmaputra River Basin (Asia) 10.0 (Sea) Andaman Sea 10.1 (Drainage system) Irrawaddy River Basin (Asia) 11 (Strait) Strait of Malacca 12 (Sea) Java Sea 13.1 (Sea) Bali Sea 13.2 (Sea) Flores Sea 14 (Sea) Savu Sea 15 (Sea) Timor Sea 16 (Drainage system) De Grey River Basin (Australia: Western Australia) 17 (Bay) Great Australian Bight (Australia) 18.352200S1392200E (Drainage system) Murray River Basin (Australia) 19 (Strait) Bass Strait (Australia)