The current national border between Denmark and Sweden dates to 1660.
It is entirely a maritime border, along Kattegat and Øresund, and in the Baltic Sea between Bornholm and Scania.The territorial waters (12 mile zone) of the two countries meet exclusively along the Øresund, extending to approximately 115 kilometres (70 miles), between Höganäs and Falsterbo.There is one road and rail connection, 16-kilometre-long (10-mile) Øresund fixed link, opened in 2000, besides a number of ferry links.
Øresund or Öresund (UK: /ˌɜːrəˈsʊnd/, US: /ˈɜːrəsʌn, -sʊnd, ˈɔːrəsʊnd/; Danish: Øresund [ˈøːɐˌsɔnˀ]; Swedish: Öresund [œːrɛˈsɵnːd]), commonly known in English as the Sound, is a strait which forms the Danish–Swedish border, separating Zealand (Denmark) from Scania (Sweden). The strait has a length of 118 kilometres (73 mi); its width varies from 4 kilometres (2.5 mi) to 28 kilometres (17 mi). The narrowest point is between Helsingør in Denmark and Helsingborg in Sweden.
Øresund, along with the Great Belt, the Little Belt and the Kiel Canal, is one of four waterways that connect the Baltic Sea to the Atlantic Ocean via Kattegat, Skagerrak, and the North Sea; this makes it one of the busiest waterways in the world.