Buyan
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In Russian folklore, Buyan (Буян) is described as a mysterious island in the ocean with an ability to appear and disappear. Three brothers – Northern, Western, and Eastern Winds – live there. A lot of strange things are said to happen on this island. Koschei the Deathless keeps his soul hidden here inside a needle placed in an egg.
Some scholars interpret Buyan as a sort of Proto-Indo-European Otherworld. Others assert that Buyan is actually a Slavic name for some real island, most likely Rügen.