Rheinhessen (in English often Rhine-Hesse or Rhenish Hesse) is the largest of 13 German wine regions (Anbaugebiete) for quality wines (QbA and Prädikatswein) with 26,444 hectares (65,340 acres) under cultivation in 2008. Named for the traditional region of Rhenish Hesse, it lies on the left bank of the River Rhine between Worms and Bingen in the federal state of Rhineland-Palatinate. Despite its historic name it is currently no longer part of the federal-state of Hesse, this being the case since the end of WWII. There have been several unsuccessful attempts to legally reunite the former wine growing districts of Mainz on the hessian side during the post-war area. Rheinhessen produces mostly white wine from a variety of grapes, particularly Müller-Thurgau (4.320 ha), Riesling (3.769 ha) and Silvaner (2.467 ha), and is best known as the home of Liebfraumilch, although some previously underrated Rieslings are also made, increasingly in a powerful dry style.
Info gleaned from Wikipedia