Denmark Region, which encompasses the Copenhagen metropolitan area with the exception of the subtracted province East Zealand but includes the Baltic Sea island of Bornholm, has a population three times larger than that of North Denmark Region, which covers the more sparsely populated area of northern Jutland. Under the county system certain densely populated municipalities, such as Copenhagen Municipality and Frederiksberg, had been given a status equivalent to that of counties, making them first-level administrative divisions. These "sui generis" municipalities were incorporated into the new regions under the 2007 reforms. The Kingdom of Denmark is a unitary state that comprises, in
Royal Library, Denmark Royal Library, Denmark The Royal Library () in Copenhagen is the national library of Denmark and the university library of the University of Copenhagen. It is among the largest libraries in the world and the largest in the Nordic countries. In 2017 it merged with the State and University Library in Aarhus to form a combined national library. The combined library organisation (the separate library locations in Copenhagen and Aarhus are maintained) is known as the Royal Danish Library (). It contains numerous historical treasures, and a copy of all works printed in Denmark since the 17th century are deposited