The tradition of the cosmic world tree is found in many parts of Asia. In insular Southeast Asia the cosmic tree unites the sky with the earth and symbolizes wholeness. In the Korean myth of Čumong (see Čumong, Korean Mythology), the hero's legitimate son is recognized when he is able to find half of his father's sword at the base of a pine tree growing out of a heptagonal stone. Also in Korea, it was believed that a sacred tree connected the three worlds of existence. Among the Turko-Mongol peoples of central Asia, cosmic trees are of great importance. For the Tartars, a giant pine tree grows out of the navel of the earth and reaches to the home of the supreme ruler in heaven. Without the cosmic tree the world above would not be able to communicate with the world below and without it the shaman would be unable to make his journeys to the spirit world (see Shamanism).