Skagen’s “straight waterway” once gated the whole Baltic
The Skagerrak runs between Denmark’s North Jutland, Norway’s east coast, and Sweden’s west, linking North Sea to Kattegat. About 240 kilometres long and 80–140 wide, it likely joins the town name Skagen with Dutch-style rak, “straight waterway.”
The strait deepens toward Norway, plunging past 700 metres in the Norwegian Trench. Its harbours range from Norway’s Oslo, Kristiansand and Larvik to Denmark’s Hirtshals, Skagen and Hanstholm and Sweden’s Lysekil, Strömstad and Uddevalla, though Oslo and Gothenburg are the only big cities on its shores. The International Hydrographic Organization bounds it in the west by a line from Hanstholm to Lindesnes and in the south-east by the Kattegat’s northern limit from Skagen toward Tjörn. Older names for the Skagerrak and Kattegat together were the Norwegian Sea and the Jutland Sea, the latter found in the Knýtlinga saga.
Until the Eider Canal, forerunner of the Kiel Canal, opened in 1784, this was the only sea route in or out of the Baltic, so international traffic has crowded it for centuries. Shipping swelled after the Industrial Revolution, and today it ranks among the world’s busiest straits. Denmark cut the Thyborøn Channel through the Limfjord in 1862 as a shortcut to the Kattegat, but it handles only small vessels.
Germany treated the passage as vital in both world wars. The Battle of Jutland, known to Germans as the Battle of the Skagerrak, was fought here on 31 May and 1 June 1916, the largest naval clash of the First World War. In the Second, the need to control the Baltic’s only sea access drove the invasions of Denmark and Norway and the northern Atlantic Wall, and the wrecks of both wars litter the seabed.
Roughly 2,000 marine species, including a distinctive Atlantic cod, live across about 3,600 square kilometres of habitat, from shallow sandy and stony reefs off Sweden and Denmark to cold-water corals and the depths of the trench, all under growing pressure from people and climate.
Source: Skagerrak
