Note: Do not rely on this information. It is very old.
NassauNassau, once an independent duchy, was annexed in 1866 to Prussia, and forms part of the province of Hesse-Nassau. The surface is uneven and fertile, and the district produces the renowned Johannisberger, Rudesheimer, and Hochheimer wines. The capital, Wiesbaden, and Ems, are noted for their mineral springs.