Сибир земја на непостоечките Северни Словени

If you ever asked yourself were the north so called Slavic lands are , this view might be well association where to search for...
Sibiria
Sibir + ia
b->v
*siVir
i-e
Sever
Sever + ia

From some of linguistics is translated as The North land 1,
what observed together as South ,West ,East whole could allowed Tatar word root explanation no more.
This because official explanation is  that name of Siberia originated from Tartars with a meaning of "Sleeping Land "" (Sib Ir).2 
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Ref :
1- https://www.etymonline.com/word/Siberia#etymonline_v_240
2-   2-Euan Ferguson., "Trans Siberian for softies  " the Guardian. Retrieved 14 January 2016.