Jutland (/ˈdʒʌtlənd/; Danish: Jylland [ˈjyˌlænˀ]; German: Jütland [ˈjyːtlant]; Old English: Ēota land [ˈeːotɑlɑnd]), known anciently as the Cimbric or Cimbrian Peninsula (Latin: Cimbricus Chersonesus; Danish: Den Kimbriske Halvø, Den Jyske Halvø; German: Kimbrische Halbinsel), is a peninsula of Northern Europe that forms the continental portion of Denmark and part of northern Germany. The names are derived from the Jutes and the Cimbri, respectively. As with the rest of Denmark, Jutland's terrain is flat, with a slightly elevated ridge down the central parts and relatively hilly terrains in the east. West Jutland is characterised by open lands, heaths, plains and peat bogs, while East Jutland is more fertile with lakes and lush forests. Southwest Jutland is characterised by the Wadden Sea, a large unique international coastal region stretching through Denmark, Germany and the Netherlands. Jutland is a peninsula bounded by the North Sea to the west, the Skagerrak to the north, the Kattegat and Baltic Sea to the east, and Germany to the south. Geographically and historically, Jutland comprises the regions of South Jutland (historically also Slesvig), West Jutland, East Jutland (including Djursland) and North Jutland (including Himmerland, Vendsyssel, Hanherred and Thy). Since the mid-20th century, it has also become common to designate an area called Central Jutland (Midtjylland), but its definition varies. There are several historical subdivisions and regional names, and some are encountered today. They include Nørrejyllland (a historical name for the whole area north of South Jutland, and not identical with Nordjylland), Sydvestjylland, Sydjylland (the southernmost stretch of Nørrejylland, as opposed to the more southern Sønderjylland), Nordvestjylland, Kronjylland, and others. Politically, Jutland currently comprises the three contemporary Danish Administrative Regions of North Jutland Region, Central Denmark Region and the Region of Southern Denmark, along with portions of the German state of Schleswig-Holstein.[1] The northernmost part of Jutland is separated from the mainland by the Limfjord, a narrow stretch of water bisecting the peninsula from coast to coast. The Limfjord was formerly a long brackish water inlet, but a breaching North Sea flood in 1825 created a coast to coast connection.[2] This area is called the North Jutlandic Island, Vendsyssel-Thy (after its districts) or simply Jutland north of the Limfjord; it is only partly coterminous with the North Jutland Region. The islands of Læsø, Anholt and Samsø in Kattegat and Als at the rim of the Baltic Sea are administratively and historically tied to Jutland, although the latter two are also regarded as traditional districts of their own. Inhabitants of Als, known as Alsinger, would agree to be South Jutlanders, but not necessarily Jutlanders.[citation needed] The Danish Wadden Sea Islands and the German North Frisian Islands stretch along the southwest coast of Jutland in the German Bight. The southern third of the peninsula is made up of the German Bundesland of Schleswig-Holstein. The German parts are usually not seen as Jutland proper, but often described more abstract as part of the Jutlandic Peninsula, Cimbrian Peninsula or Jutland-Schleswig-Holstein. Schleswig-Holstein has two historical parts: the former duchies of Schleswig (a Danish fief) and Holstein (a German fief), both of which have passed back and forth between Danish and German rulers. The last adjustment of the Danish-German border followed the Schleswig Plebiscites in 1920 and resulted in Denmark regaining Northern Schleswig (Danish: Nordslesvig or more commonly today: Sønderjylland). The historic southern border of Jutland was the river Eider, which forms the border between the former duchies of Schleswig and Holstein, as well as the border between the Danish and German realms from c. 850 to 1864. Although most of Schleswig-Holstein is geographically part of the peninsula, most German residents there would not identify themselves with Jutland or even as Jutlanders, but rather with Schleswig-Holstein. The medieval law Code of Jutland applied to Schleswig until 1900, when it was replaced by the Prussian Civil Code. Some rarely used clauses of the Jutlandic Code still apply north of the Eider.[citation needed]