Pripyat River
Based upon a proposal by Norbert Wagner, the RGA suggests that the marshes surrounding "Oium" could be the Pripyat or Rokitno marshes in the area of the modern border of Belarus and Ukraine. This is to the west of the Dnieper, and not near Southern Russia where Wagner believed "Oium" was, and so Wagner saw this area, which contains the Pripyat River, as representing the "river" which needed to be crossed "en route" to "Oium".