a castle of Germany, in the circle of the Lower Rhine, now in the dominions of Prussia. It is looked upon as one of the most important places seated on the Rhine, as well in regard to its strength as situation. It is near St Goar, and built on a craggy rock. This fortress commands the whole breadth of the Rhine, and those who pass are always obliged to pay a considerable toll. In the time of war it is of great importance to be masters of this place. It was taken by the French in 1794. E. Long. 7° 43' N. Lat. 50° 3'.