The Schorfheide-Chorin Biosphere Reserve, often shortened to Schorfheide, is a biosphere reserve in the German State of Brandenburg near the Polish border. The reserve was established on 1 October 1990 following the German Reunification and is under the protection of the UNESCO Man and Biosphere Reserve Programme. It stretches over the German districts of Barnim, Uckermark, Märkisch-Oderland and Oberhavel and incorporates an area of 1,291 square kilometres. Notable towns are Eberswalde, Joachimsthal and Friedrichswalde. The core area of the reserve is formed by the Schorfheide forest, one of the largest cohesive woodlands in Germany.