It covers approximately 570,000 square kilometers (220,000 sq mi).
The North Sea is one of the world's most intensively used maritime areas. The underwater soundscape of the North Sea - ScienceDirect The North Sea
The is a marginal sea of the Atlantic Ocean located on the European continental shelf, bordered by Great Britain, Norway, Denmark, Germany, the Netherlands, Belgium, and France. Known for its treacherous storms and rich resources, it has been a central "highway" for European commerce and conquest for millennia. Geography and Natural Features It covers approximately 570