Region on both sides of the upper Oder
I believe the answer is:
silesia
(Other definitions for silesia that I've seen before include "European region" , "Polish area" , "Central European area" , "part of Europe" , "Region of central Europe" .)
I believe the answer is:
silesia
(Other definitions for silesia that I've seen before include "European region" , "Polish area" , "Central European area" , "part of Europe" , "Region of central Europe" .)