Schnackenburg is a town in the Lüchow-Dannenberg district, in Lower Saxony, Germany. It is situated on the left bank of the Elbe. It is part of the Samtgemeinde ("collective municipality") Gartow. Lying at the easternmost projection of Lower Saxony, the town is bordered on all sides except the west by territory that was formerly East Germany. It is the least densely populated town ("Stadt") in what was West Germany, although there are nine towns in what was formerly East Germany that are less densely populated (mostly in Brandenburg).