North Sea

The North Sea lies between Great Britain, Denmark, Norway, Germany, the Netherlands, Belgium, and France. A sea on the European continental shelf, it connects to the Atlantic Ocean through the English Channel in the south and the Norwegian Sea in the north. It is more than 970 km long and 580 km wide, covering 570000 km2.

The sea is mostly shallow, averaging 90 m in depth, except for the Norwegian trench, which runs parallel to Norway’s coast and reaches a maximum depth of 725 m. Notable features include the Dogger Bank, a glacial moraine rising to just 15–30 m below the surface, which provides the region’s finest fishing grounds. Other banks, such as the Long Forties and Broad Fourteens, create navigational hazards that satellite systems have helped mitigate.

The Devil’s Hole, a series of deep trenches east of Dundee, Scotland, reaches depths of 230 m. The North Sea has been central to European geopolitics and military strategy from the Middle Ages onward. It was the heartland of the Vikings’ rise, and later powers—the Hanseatic League, the Dutch Republic, and Britain—fought to control its waters and access global markets. As Germany’s only ocean outlet, it held strategic importance in both world wars.

The coast varies greatly: Norway’s northern edge features deep fjords, Scotland’s cliffs are sheer, while the southern shores consist of sandy beaches, river estuaries, and wide mudflats. Major rivers like the Elbe and Rhine–Meuse drain into the sea, and about 185 million people live in its catchment area. Dense population, heavy industry, and intense use have caused environmental problems such as overfishing, agricultural runoff, dredging, and dumping, prompting efforts to protect the ecosystem and sustain long-term economic benefits.