The Spree Forest or Spreewald (German pronunciation: [ˈʃpʁeːˌvalt] ⓘ; Lower Sorbian: Błota, i.e. 'the Swamps') is a large inland delta of the river Spree, and a historical cultural landscape located in the region of (Lower) Lusatia, in the state of Brandenburg, Germany, about 100 km southeast of Berlin and close to the city of Cottbus (L.S.

As extensive floodplain and bog landscape, the Spree Forest was designated a biosphere reserve by UNESCO in 1991, called Biosphärenreservat Spreewald (biosferowy rezerwat Błota).

Other notable towns are Vetschau/Spreewald (Wětošow/Błota) with its reconstructed Old Slavic fortified wooden settlement (gord) Slawenburg Raddusch (Radušańske słowjańske groźišćo), and Burg (Spreewald) (Bórkowy (Błota)).

In 1991, the Spree Forest was designated a UNESCO "Biosphärenreservat" (Man and Biosphere Reserve Programme).

[1] Before the legal protection of the space there were several court disputes over the designation Spree Forest on food labels.