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