The Rhineland (Rheinland in German) today is the general name for areas of Germany along the river Rhine between Bingen and the Dutch border. To the west the area stretches to the borders with Luxembourg, Belgium and the Netherlands; on the eastern side it only encompasses the towns and cities along the river. Except for the Saar this area more or less corresponds with the modern use of the term.
Between the two world wars the term "Rhineland" covered the whole occupied and de-militarized zone to the west of the Rhine including the bridge-heads on the eastern banks (see map below). After the collapse of the French Empire in the early 19th century, the German and Dutch (Province of Jülich-Cleves-Berg) speaking regions at the middle and lower course of the Rhine were annexed to the kingdom of Prussia. The Prussian administration reorganized the territory as the Rhine Province (also known as Rhenish Prussia), a term continuing in the names of the German states of Rhineland-Palatinate and North Rhine-Westphalia. Following the First World War of the early 20th century, the western part of Rhineland was occupied by Entente forces, then demilitarized under the Treaty of Versailles. German forces remilitarized the territory in 1936, as part of a diplomatic test of will, three years before the outbreak of the Second World War.