The most important North Sea harbours for international ocean shipping are London, Rotterdam and Hamburg. This makes the southern North Sea one of the busiest areas of sea in the world, as far as shipping is concerned.
Around 100,000 people are employed in the harbour and shipping industry in the wadden region. The largest trading harbours border on the German tidal flats: Hamburg, Bremerhaven and Wilhelmshaven. Other significant German harbours are Brunsbüttel and Brake. Esbjerg is an average sized harbour city in Denmark and the largest harbour in the Dutch wadden region is Delfzijl. Wilhelmshaven and Den Helder harbour the fleets of the German and Dutch navy.
As of 2008, when all of the oil companies will work from Den Helder, this city will be the offshore harbour for the Dutch North Sea.