formerly a duchy of Germany, on the right bank of the Rhine, and bounded on the north by the duchy of Cleves, on the east by the county of Mark and the duchy of Westphalia, and on the south by the Westerwald. It contained about 1188 square miles. It was formerly subject to the elector palatine, but since 1815 has been included in the grand duchy of the Lower Rhine. The duchy of Berg was taken from Bavaria in 1806, and bestowed upon Murat, afterwards king of Naples, who derived from it the title of Grand Duke of Berg. It is a populous and flourishing district, very fruitful along the Rhine, but mountainous and woody towards the county of Mark. The principal rivers, besides the Rhine, are the Wupper, Agger, and Sieg.