The "Ecological Succession Circle" at the Lieberose Ecological Succession Exhibition Park ("Sukzessionspark Lieberose") in Schwielochsee, Landkreis Dahme-Spreewald, Brandenburg, Germany. The fields of the circle are grouped around the former heliport of the "Truppenübungsplatz Lieberose", a vaste Group of Soviet Forces in Germany proving ground (or training area) in the Lieberoser Heide. In 2014 the heliport was listed as a cultural heritage monument.