Tri-loka—The Sanskrit term tri-loka is often found in Vedic scriptures. Tri-loka means three worlds. The universe is divided into three worlds, or realms of consciousness: bhūr, bhuvaḥ and svaḥ (the gross region, the subtle region and the celestial region). In Svargaloka or the celestial heaven, superhuman beings called demigods (devatas) exist, enjoying a life that in human terms is almost unimaginable. In the subtle region exist ghosts and elemental beings. And in the gross or earthly realm exist human beings and other creatures with tissue-bodies, including the animals and plants. There is also a subterranean region where powerful demons reside. And there is a region known as naraka, hell. As explained in Bg. 3.27, the souls within these regions of material consciousness wrongly identify themselves as the doers of physical and mental activities that are actually carried out by three modes of material nature. This wrong identification is called ahaṅkāra, or false ego, the basis of our entanglement in material existence. See Demigods, Svarga.