Slavic Oak Picture

A fairly typical cosmological concept among speakers of Indo-European languages, that of the World Tree, is also present in Slavic mythology. It is either an oak tree, or some sort of pine tree. The mythological symbol of the World Tree was a very strong one, and survived throughout the Slavic folklore for many centuries after Christianisation. Three levels of the universe were located on the tree. Its crown represented the sky, the realm of heavenly deities and celestial bodies, whilst the trunk was the realm of mortals. They were sometimes combined together in opposition to the roots of the tree, which represented the underworld, the realm of the dead.
(from [link])

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