Marschacht is a municipality in the district of Harburg, in Lower Saxony, Germany. It completes the Samtgemeinde Elbmarsch with Tespe and Drage. Marschacht is only a few kilometres far away from Geesthacht. 1216: First documentary mention of the settlement as Hachede, then a part of Saxony. A change in the course of the Elbe cuts the settlement into two: Geesthacht and Marschacht.