Question: What is the area of this region of Central Europe located mostly in Poland, in which Złotniki Lubańskie was formerly part of the historic Upper Lusatia region at its border?
Sentence (from "Złotniki Lubańskie"): Situated on the left bank of the Kwisa river, the settlement was formerly part of the historic Upper Lusatia region at the border with Silesia.
Relevant evidence: Yes