The North Sea is a marginal sea of the Atlantic Ocean lying between Great Britain, Norway, Denmark, Germany, the Netherlands, Belgium and France on the European continental shelf.
Spanning more than 970 kilometres long and 580 kilometres wide, it covers 570,000 square kilometres and connects to the Atlantic through the English Channel in the south and the Norwegian Sea in the north. The sea has shaped European history for centuries: it was the centre of Viking expansion, contested by the Hanseatic League, the Dutch Republic and Britain for control of global trade routes, and served as Germany’s sole ocean outlet during both world wars. Today it remains vital for shipping, fisheries and energy, hosting major north European shipping lanes and a rich source of wind and wave power. The coast varies from deep Norwegian fjords and Scottish cliffs in the north to sandy beaches, river estuaries and wide mudflats in the south. Dense population and heavy industrialisation around its shores have created environmental pressures—overfishing, agricultural runoff, dredging and dumping—prompting efforts to safeguard its ecosystems and long-term economic value.
