Großer Graben and Schiffgraben together are an artificial waterbody with ambiguous flows in Lower Saxony and Saxony-Anhalt, Germany, partly forming the border of both Länder.

It is fed by lateral sources and by the humidity of the wetland it passes.

The top, almost without flow, is a pseudo-bifurcation and part of the section called Schiffgraben.

The border between the names Großer Graben and Schiffgraben is situated east of the pseudo-bifurcation.

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