From the Wikipedia page [1]
Oberspreewald-Lausitz (Upper Sorbian: Wokrjes Hornje Błóta-Łužica) is a Kreis (district) in the southern part of Brandenburg, Germany. Neighboring districts are (from the north clockwise) Dahme-Spreewald, Spree-Neiße, the districts Kamenz and Riesa-Großenhain in Saxony, and the district Elbe-Elster.
The district was formed in 1993 by merging the previous districts of Calau and Senftenberg and a small part of the district Bad Liebenwerda.