Bad Belzig, until 2010 Belzig, is a historic town in Brandenburg, Germany located about 70 km (43 mi) southwest of Berlin. It is the capital of the Potsdam-Mittelmark district.

Brandenburg, officially the State of Brandenburg, is a state in northeastern Germany. Brandenburg borders the states of Mecklenburg-Vorpommern, Lower Saxony, Saxony-Anhalt, and Saxony, as well as the country of Poland. With an area of 29,480 square kilometres and a population of 2.5 million residents, it is the fifth-largest German state by area and the tenth-most populous. Potsdam is the state capital and largest city, and other major towns are Cottbus, Brandenburg an der Havel and Frankfurt (Oder).