Nassau (region)

Nassau (/ˈnæsɔː/ NASS-aw, also UK: /ˈnæs/ NASS-ow, US: /ˈnɑːs/ NAHSS-ow, German: [ˈnasaʊ] ) is a geographical, historical and cultural region in today's Rhineland-Palatinate, Hesse and North Rhine-Westphalia in western and northern Germany. Named after the Nassau Castle, itself named after the town of Nassau, it consists of the territories of the historical Nassau realm, in the forms of the County and Duchy of Nassau. The independence of the realm, as the Duchy, ended with the occupation by Prussia and was annexed into the Province of Hesse-Nassau in 1866, Nassau became a briefly "de facto" province of Prussia (as "de facto" these were abolished by the new 1934 territorial subdivisions), after the separation of the former as the Province of Nassau, in 1944. Much of the area is today part of the Nassau Nature Park. Nassau is also the name of the smaller Nassau collective municipality, the area surrounding the town of Nassau, which has been merged into Bad Ems-Nassau collective municipality.