North Sea factsNORTH SEA FACTS Length north-south 960 km Width east-west 580 km Surface area 750.000 km² Volume 94.000 km³ Average depth 95 m Maximum depth 700 m (Norway) Annual river water input 300 km³ directly and 470 km³ via the Baltic Sea Drainage area 850.000 km² (184 million residents) Average temperature in winter 6°C Average temperature in summer 17°C Salinity 34 à 35 g salt per litre of water Tide difference 0 to 8 m
The North Sea lies between Norway, Denmark, Germany, the Netherlands, Belgium, France and Great Britain. It links up with the Atlantic Ocean to the north and also the southwest, via the Channel. To the east it links up with the Baltic Sea. The Kattegat is considered an interchange zone between the North Sea and the Baltic Sea. Including estuaries and fjords, the total surface area is approximately 750, 000 km² and the total volume 94, 000 km³. This represents less than 1/500 of the total water surface of the earth.
The coasts of the North Sea vary from mountainous coastlines interspersed by fjords, to cliffs with pebble beaches to low cliffs with valleys and sandy beaches with dunes.