WEBBrandenburg, 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 (11,382 square miles) and a population of 2.5 million residents, it is the fifth-largest German state by area and the tenth-most populous.