is the "celestial world", the ground to which "Earth-Water" (Yer-Su) belongs too, and the "underworld" ruled by the spirits beneath the earth. They are connected through the "Tree of Worlds" or Tree of Life in the center of the worlds. The celestial and the subterranean world are divided into seven layers, although there are variations (the underworld sometimes nine layers and the celestial world 17 layers). Shamans can recognize entries to travel into these realms. In the multiples of these realms, there are beings, living just like humans on the earth. They also have their own respected souls and shamans and nature spirits. Sometimes these beings visit the earth, but are invisible to people. They manifest themselves only in a strange sizzling fire or a bark to the shaman. Heavenly world The heavens are inhabited by righteous souls, the Creator and the protector deities. The celestial world has many similarities with the earth, but as undefiled by humans. There is a healthy, untouched nature here, and the natives of this place have never deviated from the traditions of their ancestors. This world is much brighter than the earth and is under the auspices of Ulgen another son of Tengri. Shamans can also visit this world. On some days, the doors of this heavenly world are opened and the light shines through the clouds. During this moment, the prayers of the shamans are most influential. A shaman performs his imaginary journey, which takes him to the heavens, by riding a black bird, a deer or a horse or by going into the shape into these animals. Otherwise he may scale the World-Tree or pass the rainbow to reach the heavenly world. Subterranean world The underworld is the abode of wicked souls, devils and evil deities. There are many similarities between the earth and the underworld and its inhabitants resemble humans, but have only two souls instead of three. They lack the "Ami soul", that produces body temperature and allows breathing. Therefore, they are pale and their blood is dark. The sun and the moon of the underworld give far less light than the sun and the moon of the earth. There are also forests, rivers and settlements underground. Erlik Khan (Mongolian: Erleg Khan), one of the sons of Tengri, is the ruler of the underworld. He controls the souls here, some of them waiting to be reborn again. Extremely evil souls