As you sail along the Limfjord, to one side of your ship is North Jutlandic Island (which was, in fact, connected to the mainland until 1825, when a storm destroyed the isthmus that linked it to the rest of Denmark). To your south, the Jutland Peninsula extends from the fjord to the German border. Jutland includes roughly two-thirds of Denmark's territory, with the rest consisting of more than 400 islands, among them Zealand, where Copenhagen is located. The peninsula has long protected many of Denmark's islands from the severe storms of the North Sea. Today, it's mostly flatlands with dunes and harbors along its coasts and farms in its interior.